This game is seriously, extremely fun. Seriously, download the demo they have on their website, and try it out. It looks and feels great, the shooting is slightly strange but you get used to it, the tactical possibilities and maps are great. First, some tips if you want to play, cause the game just throws you right in in the demo, no tutorial.
1.Cover is the most important thing in the world. Since there are OHK more often than not, you have not get hit. Control lets you crouch behind cover, so pop in and out to gun people down.
2.Flanking is the second most important thing. How do you stop people from using cover effectively? You flank around them so their cover is useless.
3.Shooting is slightly strange, but when you get used to it, it makes alot of sense. Your crosshair is where you are AIMING at, but the smaller white one in the middle determines where you actually will hit. If the laser in the middle of your crosshair is red, you can't aim there, and if it's green, you can. Aiming is not instant, you take about half a second to line up a shot. Just experiment with it a bit and you will figure it out.
4.Grenades you can throw with g, hop over walls and climb onto things that don't have ladders with space, if you get a rocket launcher use B to switch to it, and you can pick up other peoples guns with F.
5.Guns. The G36 is better than the AK47, but only a little. The PKM is better than the M60 machine gun, even though it has a smaller clip, you don't have to go prone to use it. There is also a M24 sniper, which is really good but also rare.
Seriously, go check it out, this is a great game.