In defense of good old Stephen Kingy-Baby, from few posts back, I like his endings. Everyone likes a happy ending now and again, but I do like his ambiguous "everythings-not-sorted-but-deal-with-it" endings! I didn't even mind the ending of Dark Tower series, which I know has caused many a discussion. The ending of "Cell" seemed like an almost happy ending for once, giving a bit of hope for Clay's son.
But then, I do love Sk's books. He rocks.
Hmm...an ending that I've hated...well, ALMOST the ending...the part in the Hobbit when Smaug is killed by a totally unrelated character. What?! The bloke just strides in about 3/4 of the way through and claims all the glory!
I also cannot STAND the ending of Harry Potter and the Order of the Phoenix. I refuse to read the chapters when they go to the Ministry of Magic.
That's all I can think of at the moment, I shall probably return anon to rant some more!!