Another great FPS for this gen of systems.
The graphics are very good, except for some textures, but there is a great amount of character detail. All the windows and most cover is destructible. There's some good lighting and shadow work as well. Overall it's no "graphics king" but it's still a great looking game.
The sound is fine but nothing special. It has a passable soundtrack with some very good gun and explosion effects. There's some solid voice acting as well.
The gameplay is smooth and feels overall very solid. The variety in guns is great, and the developers payed a lot of attention to detail when making them. The alternative fires all have their uses. Using the Siaxis to throw the aliens off of you occasionally is fun, and not overused. The campaign is pretty fun although somewhat predictable. The A.I. is a contender for the best I've seen in a game.
The only complaints I have with this game is that the combat itself isn't very original and there are already a ton of FPS games out there, and its a shame to see a developer like this that is so good at platformers move to shooters. If you have a Playstation 3, I highly recommend this game.