I don't know. I think alot of people are simply disappointed because it's not exactly what they were expecting for the end.
I don't agree. I think most who are having some problems with how this season is unfolding didn't have specific ideas of how the show would end other than thinking we'd get several "Oh, wow" moments that help tie in a lot of the things the show has promoted over the years. Instead, we seem to be getting more than a few "Is that it?" moments lol. If I were to generalize, though, in the same manner you have, I'd say that most of the people who claim that fans are making too big a deal over stuff are really just wanting to defend their favorite show moreso than actually taking into account the validity of the criticisms. Everything is chalked up to fans not being patient enough, not being open enough, to wanting every small minute detail explained in length...funny, but it's never chalked up to the show may have just dropped the ball on occasion. It's ok to say that lol.
There have been a ton of times in Lost where we think something may be vitally important and game changing, but as time goes on, we find out, it wasn't that major. I mean, remember when the biggest thing was "how are they going to find food now that the Oceanic 815 food carts are empty"?
Actually, no I don't remember that being a real issue for anyone lol...especially on an island full of fruit, the occasional wild boar, and an ocean full of fish. Besides, that's really not the same thing as what people are complaining about...where the Losties would get more food didn't play at ALL into the mysteries of the island, Dharma, the Others...those are the things we're discussing, the things that made the show so captivating and worthy of theorizing about.
I have a friend who, midway through this season, said they felt like all the things they had been wondering about over the years no longer mattered. There are a few too many times this season where I felt the same way. And obviously I'm not alone.
The Sun/Widmore alliance, well it took all of 1 scene to create, and it had a pretty major impact on a vital scene that we saw played out from 3 different points of view on the dock. I think using 1 scene to create that kind of gun pointing suspense was worth it. Plus it had the major reveal to Sun that Jin was still alive.
How in the world did Sun confronting Widmore play ANY role in the dock scene? That scene could have and would have taken place even if Sun never met Widmore. She still could have a gun, she still could say things like "It wasn’t for you, Jin would still be alive" and "You're lying" even if she never talked with Widmore. She didn't need Widmore to hate Ben, she already hated Ben and wanted him dead, and that would have still been the case even without her confronting Widmore on the street. Their meeting was actually uneventful in terms of how it effected things afterwards.
The Dharma thing, you are not alone. I think there are alot of fans that would have been happy with Lost being about the Dharma Initiative. But it's not. The DI played an important role in the history of the Island and the journey of our characters, but the show isn't about Dharma. Viral marketing campaigns don't make a show. I'm not going to go into all the ways Dharma played a major role in the story (hatch, food drops, barracks, orchid, hydra, etc. etc.) but to just say they were nothing special is disingeuous.
You are missing some vital points, here. For starters, the food drops, barracks and hydra did not play vital roles in the show. We were lead to believe they would...but what is occurring right now that could
not have occurred if the food drops never occurred? What is occurring right now that could
not have occurred if they lived somewhere else other than the barracks after the purge? Nothing. And if they never went to the Hydra? Nothing.
Right now this show is about Jacob, MiB, and why the island is important as well as why a new "protector" is needed. Nothing connected with Dharma is part of any of that, other than the Swan hatch--which I mentioned. Nothing else concerning Dharma turned out to be important afterall. Why they were there? Who cares, doesn't play a role in anything as we near the end of the series. Their experiments and activities didn't eventually provide the characters--and thus the audience--with a better understanding of what the island really is. All that took was a flashback of Jacob explaining the island to Richard in about 45 seconds lol...and nothing Jacob said puts any of the Dharma activity into a new perspective or shines a brighter light on things they did in the past. Who are the big wigs behind all of the Dharma stuff? Who cares, other than as an answer to a trivia question some day.
Dharma's existence provided some damn good mystery for about 2 seasons, then fizzled out in its importance. And, yeah, some of us think that was a damn shame it did, and that the show would be much better if it had provided better explanations.
As for Aaron, the full story has yet to play out, but yeah, I was kind of expecting a larger role for the first baby to be born on the Island for who knows how long. Then again, it really doesn't take that much away from the show because Aaron did have a large effect on the main characters lives, Charlie, Jack, Kate, and of course Claire. But yeah, we all thought there was more to it for this kid.
I don't see how Aaron had a "large effect" on anyone other than Claire and possibly Kate. But the point is, the show made it seem as if something extremely important--or extremely dangerous and evil--was being effected by Claire's unborn child, that the kid would play a pivotal role in everything one day. I'd like to think that extremely important, extremely dangerous and evil thing was
not simply letting Charlie be a surrogate father for a few months lol. I want to believe that the psychic saw something more troubling in his vision to make him put Claire on a plane other than allowing Jack to realize he has a step-sister

...
Think of it this way: imagine if we had found out this season that, had Aaron not been born on the island or if he had been raised by anyone other than Claire, the evil that the island is protecting would have surely escaped and caused the end of everything as we know it. THAT would have been an "Oh, wow" moment and would have put past episodes and comments about Aaron into a pretty cool context. But that didn't happen. Aaron is off living with his grandmother, and whatever it was that caused the psychic to freak out and buy Claire a plane ticket at his own expense seems irrelevant now. It just seems like yet another area in which the show dropped the ball.
As for the Others, we kind of got their orgin story. The first Other was Richard. They are the extension of Jacob being protector of the Island. I just don't think we're going to get a scene that shows The Others High Council sitting around a table discussing diplomacy like it was some Star Trek movie.
You realize, though, that the show has yet to actually explain why the Others exist at all? Not even slightly. Well, that is unless the explanation is "They're just a bunch of people with no real importance other than Richard". And the leader of the Others was Ben!! Ben, one of the most memorable tv characters ever created...the group he was leading should have been given a better reason for existing. Again, the theories that fans came up with were actually VERY intriguing and interesting. I myself loved the idea that the Others were a splinter group from Dharma who tapped into the realities of the island and, because of that, found themselves wanting to protect it at all costs. It's too bad the writers didn't think giving an interesting back-story and history about the Others was worth the time. We don't even know how Widmore and Eloise became "Others", when they arrived on the island, if they arrived at the same time, etc, etc. Once more...the show dropped the ball in my eyes by overlooking some GREAT possibilities.
There's nothing wrong with wishing for them to explain one thing, or expand on another thing, but the show is what it is. And we knew that when they said, "After 6 seasons, we are done." that not everything was going to be expanded on.
That doesn't mean that everything with the show is fine as it is and there are no valid reasons for criticism.