I've played it quite a bit... and my honest opinion is that the game is excellent. But, it is probably only a game you can play one-off through the story. The action does get a little repetitive. The cover system is amazing I think, because even if you ain't right up to a wall you can use it and your guy just dives into the wall for cover. The cover run is also a nice touch. And how you can dive from spot to spot whilst remaining covered is decent.
The cover firing can get annoying sometimes, because if you've got an enemy on the opposite side of your cover and you fire at him.. sometimes it doesn't hit him. Also, the fact that the enemies are practically invincible sometimes annoys the fuck out of me.
I also think that some tweaks could've been made to the A.I. of the enemies because at times it is brilliant. Like, if you throw a grenade they all run for cover.. and if they are out in the open and get shot at they dive for cover. But, some enemies just come gunning for you despite being shot at from like four different angles.

I still think the game is killer.. but I wouldn't say it is deserving of the praise it is actually receiving. A lot of magazines and shit are calling it the "BEST GAME EVER" which I think is bullshit.

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