Awesome game, that even is an unique genre on it's own... And also the first and probably the last time i agree with GS.
This game also made me laugh at some point, it's kinda a spoiler (not sure =P) but after you take a certain elevater, you see some robots dancing their a$$ of, while a bunker-like robot (transformed into a speaker) is playing some disco music ( http://www.youtube.com/watch?v=rTRHnZCOSmg ).
Score:
Gameplay: 10/10 very smooth gameplay, very easy to understand (in the beginning of game) and to handle...
Sounds: 8/10 +1 (for the awesome discomusic XD) great sounds, but no that awesome, it could be better...
Graphics: 9/10 great graphics, very detailed, but the explosions (the game is full of it) could be better in my opinion, not that there bad though...
Also, gamespot said that the dialogues suck. Well, it's true, the dialogues are the only bad thing of this game, cuz really you could almost say they suck. But just ignore them, and you'll love this masterpiece. =D