I wouldn't say I'm not happy, but I would say I want more.
I liked how it wasn't an ambiguous ending, they say what it is and stuck to it, so I can't dislike that. I find ambiguous endings cheap and really unsatisfying. While enjoying the finale throughout...there wasn't quite enough for me to feel like I got full closure in the story. There was closure, but I feel like I need more. I feel like there should be another 3 episode or something to tie up everything else and to give me a little more closure to feel completely satisfied.