Best in the series. Great music, great story, nice graphics. After Bioshock this is the best FPS on the market.
First thing that surprised me was graphics. Characters models, jungle, water... It all looks very good. It's actually nice that game so big looks so good.
Another thing was main character. Not that often I find game written in the way that you actually care about him getting hurt, about his friends etc. This is actually the part of this game, that story is not only the background to shootings it's the other way around. Story makes good work to motivate you to get better, stronger.
Gmaplay mechanics is rather typical but well executed. Great addition is the Co-Op mode. Also typical in a way but very fun to play with friends.
In general this is the game that I can easily recommend to anyone who likes good shooters. After Bioshock 2 this is the best FPS I have played.