MW2 has to be the greatest game I've ever played, but I refuse to play with anyone that runs around with a noobtube or thumper with scavenger pro, It's the noobiest setup and requires no skill, as soon as I see someone do that, I leave, people that use these crapy nooby techniques ruin the game, the only gun you need is the UMP45 with a silencer, and an AA-12 for room raids.
My setup:
UMP45 silenced
Spas-12, AA-12 or the corsair with a tactical knife.
Stun grenades, throwing knife
Marathon
Cold blooded
Commando
Harriers, Chopper Gunner, Nuke
Sniper rifles such as the intervention were invented for 1/4 scoping (quick scoping) There's nothing let getting 4 or 5 mates, and running around shelling seven shades of #105### out of each other.