Hi mindsparkle, first off, I really enjoy reading your posts here, I am sorry the show jumped the shark for you last night. I hope the show can win you back at some point.
I am really surprised that last night's episode would be considered one that would deliver such a fatal sucker-punch to a dedicated viewer like yourself. I agree it was a little unsettling watching Eko get tossed around like that and I am sad to see him go (he was a favorite), but this is not the first time something like this has happened, and I found this to be essential to the story. We now have a pretty good idea as to what happened to the airplane pilot way back in Season 1. We have a better understanding as to how the characters are so vividly interacting with "hallucinations" on the island. This was a HUGE reveal from my point of view. Tying off some huge crucial questions.
How would you have preferred TPTB revisit the smoke-monster-security system story arc? We still do not know all of the details behind this crazy security system monster. I assume you were not a big fan of the Eko-centric episode from Season 2 where the monster confronted Eko? I guess what I am trying to write here is, I really do not see how this was any more "sci-fi" than all of the previous Island security-system / smoke monster encounters since Season 1 Episode 1.
NOTE: I am not writing this to change your mind or attack you, I am merely curious about a few things you had to say. Please feel no obligation to respond. You seem upset, so I hope this post does not offend you. I hope your day is getting better 
a_dot_out... Finally, I'm back on the computer. I wasn't able to access this site all day long, I posted the one message and then the site was down or I would have responded sooner.
Each strange unexplanable sight we have seen, I have had to suspend disbelief to keep going with the story... as I'm sure everyone does. And, I know, a monster on an island kinda set the whole story on the supernatural side to begin with and surviving the crash was a stretch... but, not knowing enough left the door open that perhaps these events could be explained...
I felt the smoke bashing Eko was simply a matter of the straw that broke the camel's back... I felt it was one step too far... too far fetched, too uncomprehendable for ME... yes, I know the world doesn't revolve around me ... darn! And, I think your line
deliver such a fatal sucker-punch really opened my eyes... I realized that I had an idea/an agenda in my head about what was going on and this new informaton did not jive with what I had in mind... I was hoping the security system or island anomaly whatever it is... was mechanical, man made and controlled... I expected to see Fenry behind the curtain like the wizard. Silly, huh... I didn't even know how attached I was to this idea until today!
After giving the episode some thought and reading other people's opinions I got more and more relaxed with the idea that the bashing smoke was still within the parameters that will allow me to continue to suspend disbelief.
I AM dumbfounded by the episode and can't concieve of an explanation for the bashing smoke -- it has thrown me for a loop... After watching previews and reading spoilers for next week I'm back on track... plus, my desire to be super opinionated doesn't just subside at the whim of an emotional outburst!
I really appreciate your challenging my statements and my beliefs... in fact, I've often stated that this is the real reason I am so attracted to lost, the show makes a person think, it challenges your values, your biases, your emotions, hell -- your world paradigm... and that can't be a bad thing! Thank you, I owe you one!