With a difficulty that really rewards the player and one of the coolest AI around this is a great tittle.
This game has decent graphics that even when you got lots of things happening at the same time it holds the frame rate nicely, The game-play is very well implemented, the ability to deform the terrain is a nice twist and this game really rewards the playing experience with a nice set of enemy AI and great firefights.
Gamespot says the terraforming is misused or underused, but it's all relative, you can play this game using it at its minimum or use it wisely to your advantage. For instance it's a great way of coming up with a quick cover during a firefight.
The enemy AI its one of the coolest to fight that came out this year, enemies will try to flank you, and they won't just stand there waiting to take a hit. They'll use whatever cover they can find nearby, and if close, try to melee you down. Combat can get really exciting; lots of enemies at the same time trying to kill you will force the player to use the multiple weapons available creatively in order to succeed. At this point it's worth mentioning that gamespot stated that the game is too hard and punishing, but the point here is being creative and adapting yourself with the terraforming, grenades, melee and whatever you can do to survive the many difficult but exciting firefights.
That's where this game really shines, it has an incredible pace, you won't find a single loading screen after the main menu or loading your saved progress. You have only one main load after one of the before mentioned actions and that's it. Rock solid pace from the beginning to the end.
If you are tired of those easy-to-beat games that simply feel no rewarding to play, this is a great game that's at least worth renting, especially if you like intense firefights, explosions and all this wrapped with a necessity to think quickly and adapt in order to survive.