Superb, intense multiplayer action game and all for free
You can choose from 3 different player models available and fight against each other using 9 different weapons and 3 types of grenades (Frag grenades, Remote Bombs and Proximity mines). It also has a really great combat melee system called unarmed attacks.
The graphics great with an even better gameplay. The game is well balanced and has everything you need to keep you in front of your computer for a long time not to mention of the possibility of customizing your own dedicated servers it's a game you can't miss.
As every game it also has it flaws. One of the biggest is hackers all over the place and long load times or noob players accusing you of cheating, but it's still a great game worth playing.