The main ones that come to mind:
Halo series: nothing special in and FPS and highly overated/overhyped. (haven't played the strategy game so I'll keep my mind open on that... and it's made by Ensemble so it's probably good!)
GTAIV: It feels like a step down from San Andreas
Resident Evil 4/5: Horror? What horror? Actually, a general complaint about most "survival horror" games these days
Little Big Planet: Just doesn't gel with me
3D Mario games: Don't dislike them that much... just prefer the 2D Mario games