I'm surprised Final Fantasy X-2 hasn't been mentioned more than once already. I hate that game with a burning, unrelenting passion.
It's like Nomura went into the game saying, "Hey, you know all that good stuff about 10? The interesting turn-based battles and the complex, thought-provoking story? Yeah, lets just piss on that, and put all the girls in skimpy outfits. Cause that sells, right?".
I mean, yeah, a good sequel SHOULD change a few things, but this game just feels completely at odds with the original. Plus, it just feels cheap. Almost all the areas from the first game are re-used shamelessly, a good chunk of the enemies are also re-used (including the unforgiveable sin of re-using bosses), and the final boss was not only a let-down, but AGAIN, it was a re-used character model.
But the most annoying thing about it is that it's completely and totally pointless. I LOVED 10's ambiguous, non-fairy tale ending. It let you fill in the blanks yourself. But this one just throws all that away, in favor of telling a crappy, disjointed story.
...damn, it felt good to get that rant out of my system.