Bad guns:
All LMG's - Just to much recoil for me/too slow rate of fire.
MP5K - Can't handle the recoil
Tar-21 - Don't know why i suck with this gun, but i just do :confused:
Good Guns:
AK-47 - Always used it in CoD4 and it didn't change that much in MW2 so i'm pretty badass with it

Scar-H - I love this gun because of its high damage. I am the best with it with Silencer or Extended Mags attached.
ACR - Love it because it has 0 recoil and it's great for long range shooting and big maps like Wasteland. Usually use it with Bling Pro Red Dot Sight/FMJ.
UMP .45 - Rushing gun that is the best for me with silencer.