Atmosphere: 7/10
Gameplay: 9/10 (Fun riddles)
Story: 8/10
Controls/Engine: 9/10
Sounds and Music: 7/10
Graphics: 6/10
(played 14 hours - completed all achievements)

Atmosphere: 9/10
Guns: 7/10
Graphics: 9/10
Story: 6/10
Controls/Engine: 10/10
Sounds and Music: 7/10 (there is not really music):
Gameplay: 8/10
Characters: 5/10 (I hate Alyx)
(played 25 hours - completed all achievements)