This game had very poor critics, and although after playing the tutorial I feared that it was going to be very repetitive, I actually found it very entertaining until the end.
The graphics are very good, almost on par with the Gears of War saga, and the terrain deformation puzzles you have to face in order to progress are quite varied.
The diversity of weapons is more than enough, giving you a change to engage enemies in different ways at different stages of the game. The only ones that are really similar are the "bulldog" (the Atlantic Alliance standard issue assault riffle) and the "pacific machine gun" (that is what vanilla enemies drop, so you end up replacing the former one with this most of the time).
There are some tough bosses too, although the final showdown could be more epic.