A couple of friends of mine recently joined and are addicted. And seeing my l33t skills they decided to form a clan around me and make me their leader lol. So if you're playing on the 360 and see anyone from the [TUFF] clan, beware! 
For a second there I was was going to say I see you guys all the time but it must be another TUFF Clan running around on the PS3 servers then.
I switched my main gun now from the M4 to the G3. I got bored with using the M4 all the time, and I got fed up with its accuracy too. I can't decide on my perks though. I've always had Stopping Power and Deeper Bullet along with 3xFrag equipped but I need to find other good combinations. Its just that I usually equip whatever and adapt to my limitations or whatnot.
I keep switching between the Barret .50 and the M21 since I just cant find which of the two suits me best. It just annoys me when I take a shot with a sniper rifle and the game decides to not detect it as a hit. Also working on my perks for sniping as well.