From the best multiplayer game ever made to even a better multiplayer game ever made.
I will break down the categories for you:
Gameplay: basic controls that will make the game enjoyable to play. But, you're character can get killed very quickly and you'll have to wait for a while until you can start playing again. There's nothing much to say but it's a great game by its gameplay.
Graphics: a huge improvement from 1.6. The character models look very nice, the rag doll effect makes it very realistic. (Unlike in 1.6 when the guy can die floating in thin air). The environments are very well remade and the weapons look very realistic as well.
Sound: The sound is great. Many radio commands and microphone enabled. The sound effects are great and sound very real.
Value: This could go either way. If you pwn n00bs then you'll definitely continue to play this game for days yet not months yet not years to come. But, if you get pwned then you'll probably quit the game almost immediately. As for me, I tend to pwn n00bs.
Tilt: this game is a whole lot of fun to play. if you don't have enough money then just get 1.6. You're in for the same experience. This game is just ... * two thumbs up*