Gran Turismo series- I don't know why, but I just find it boring. I guess I prefer the 'zany' racing games like Mario Kart.
Resistance: Fall of Man- I played the first 10 or so chapters, and found it quite dull. The aliens made the same movements every time, when I died the game would respawn me right where I died in an infinite loop, and it just felt like Call of Duty with different enemies to me.
And whoever said Square hasn't made a good RPG since FF7: Kingdom Hearts says hi, then kicks your ass.