Most of what he roasts games for I agree with:
Repetitive gameplay
Bad storytelling (include storyline not integrating with game well, bad voice acting, bad dialogue, not ending the story at the end of the game, plots that do not make sense)
Quick time events (Old for me after RE4)
Remakes
Over-emphasis on user generated content
MMORPGs
I can remember a few games he does like:
Half Life 2
Thief 2
Psychonauts
Killer 7
Beyond Good and Evil
Portal
Besides the point, he himself admits that his reviews aren't as funny when he likes the game.