I truly enjoyed this game. It has good graphics even for year 2008. The locations and objectives never get repetitive. Enemy AI could be little bit better, but there's not much to complain on that part either.
Storyline is pretty superficial/typical for shooters, but that is highly compensated with gameplay. Although the game is linear, you can still choose different tactics and/or routes to get things done.
Therefore I highly recommend this game for everyone, who like first person shooters.