So I bought this a couple days ago at the urging of a good friend.
Have to say, I'm not really a fan. I don't like the perks, not a fan of the guns, spawn points are all funky, and the lag sucks. Also, what's up with the pistols being so ridiculously overpowered? I think I have a better K/D holding the Tac-45 than any of those piece of shit SMGs. All the shock charges, bouncing betties and claymores are annoying as hell too. You have to run Engineer as your 3rd perk if you run-n-gun.
Speaking of running and gunning, you basically can't do that in this game. Well, I can't yet anyway. I'm not sure if its the lag, the fact that I just don't know the maps very well, or those worthless ass SMGs (seriously, they ****ing suck), but whenever I run-n-gun I get slaughtered. I had to completely change up my play style in order to be competitive. Now I play slow and cautious with an AR, which I hate. I prefer to run around like a mad man.
I will say that I'm pretty good at run-n-gun with the shotgun though. I use the SS12 or whatever with the Tac-45 backup and almost always go above 2 K/D so that's good. You just have to constantly be moving and dipping in and out of buildings/structures and never get caught out in the open.
"I don't know how to put this...but I'm kind of a big deal"