A great game, but it needs a little more
The terrain deformation could have had a little more presence in the game, instead of being more relegated to the occasional puzzle, not to say the ability to create cover wasn't useless. There just needed to be more even use of the deformation, some areas deformed more than others, but there was no way to know without trial and error.
The guns are unique to say the least, ground torpedoes, black hole grenades, and sticky-bomb guns, every basic weapon is here as well as the collection of unique ones.
The game play is fair , not amazing but not downright horrible either, it works and thats all it really needs. You will occasionally find yourself crouching accidentally, or dieing from something inexplicably cheap, but those are far and few between.
As far as replay value goes, collecting the data cells to unlock weapons in the weapons testing mode is a good start.
And for all you achievement whores out their each weapon has an kill achievement, even if you don't get it in game play, you can still get them in the weapons testing mode, which adds some value.
all in all a good game, while we wait for some of the bigger titles coming soon, if your unsure, rent first.