The Force Unleashed 2 had not only one, but two awful endings. (SPOILER)If you choose to spare Vader (which btw that entire end duel was a pile of horse. Vader was already overpowered and damn near immune to every force power in your arsenal, but those smurfing clones were an added bull!) you imprison him and you never get to find out if you're the real Starkiller or just a clone. If you decide to kill Vader another Starkiller clone appears from nowhere and kills you and everyone else. That's exactly what I smurfing want when I turn to the Dark Side.

Prince of Persia 2008's ending bothered me. I have yet to play the expansion though.

Fable III's ending was retarded

BioShock 2. (SPOILER)I honestly have no idea what even happened. Did he not survive the trip? The fact that there was no final boss fight with Lamb made this ending .

I really liked FFX's ending. It was pretty emotional despite me not liking Tidus vary much.

Kingdom Hearts is another one I really enjoyed.