I forgot about anime's!
If I use them then I can point out Inuyasha as won of the worst finales I've personally seen. Granted, they plan to pick it back up eventually, but they left so many lose ends and plot points left unanswered and in the end, I felt like the show was a bit of a waste. I did enjoy it but the ending just left so much to be desired.
As for finales that I liked: Fullmetal Alchemist was very satisfying. Things fell into place nicely and it just felt like time well spent.
