I liked this game mostly, especially the sense of humor lampshading the gameplay elements that don't make 'real world' sense. The secondary weapons were interesting, and I like that grenades took out floors and walls, making their use a little more strategic than just lobbing them and killing everybody in sight. Fall height was nice, too.. it encouraged slightly more cautious gameplay, although I think you could survive every level by always crouch-walking.
There's a game killing bug in level 5 (I think? First level of the secret base) where suddenly, the game jumps me to the background of the title screen while the game continues running behind it (or away from it). I can't see anything, but I can still hear the terrorists shooting me until I die. It's rather frustrating, as I'd like to finish the game. Since I can't, it's only 3 out of 5. Hope that bug gets fixed soon.