That I've played? Only two stand out as being bad:
X Edge - It was just bad, only played it for maybe an hour before I got sick of it
FF13 - What really let me down was the combat. The story was alright, I didn't hate any of the characters, but the combat could have been much better with just one change: let us move the character we're controlling! There is nothing worse than having, say, a Ravager and a Medic stand next to each other, refuse to move, and get hit by all area attacks cast on either one of them.
I also hate what they did to FF4 on the DS, but I do like other versions of the game.