I was actually disappointed with the Buffy finale. The whole thing about leaving Buffy's true feelings about Spike with a question mark thanks to his statement before he died. And I always saw Buffy end with her fighting like River did in Serenity. Every time I see that scene, I think, "That should have been Buffy's fight."
And even though I know in RL it would be best that way , I couldn't help but scream at the TV when Jackie ended up with Fez and not Hyde in That 70's Show.
The BSG ending was good and bad for me. I loved the sad ending with Adama and Roslin. It was expected and beautiful. And then there was Starbuck as an angel?!?

I have to say that I loved the Roseanne ending. Where the surprise ending was that the show was her rewritten story of her life. Becky & David, Darlene and Mark, Jackie was gay and not her mother, Dan actually died... mind bendingly awesome ending. At least to me.
The end of Rome was pretty good too, I think. Titus Pullo walking into the crowd with his son... cute.