My personal ratings,
DOOM 3:- 75/100
For: Great graphics, scary environment
Against: Gameplay monotonous, bad story
Half Life-2:- 86/100
For: Great gameplay, varied levels, excellent puzzles
Against: Average AI
Halo 2:- Never Played
Far Cry:- 92/100
For:- Excellent graphics, Great story, AI marvellous
Against:- Many patches required for stability, Need correct drivers for Video card