More or less a more streamlined, shorted, on rails version of the base game. No real variety in enemies or weaponry here, but the gameplay is a least smoothed. Its more modern military shooter, less Far Cry 1. I ran the game via the 64bit exe so my game time on record here isn't accurate. Seemed to perform better at least. The story is more self contained thus not disappointing compared to the first but it just holds the story together and isn't at all interesting on its own.
Did you like the first or shooters in general? Then by all means, play this one, its more of the same and handles and looks just fine. Not really worth picking up otherwise but I bought it on $5 sale or so, so not too bad if you just want some AAA budget time filler game.