I have set myself guidelines on who can use or do certain things in MW2, without being called a complete noob.
1. Snipers. I think that snipers who suck at sniping can camp. Running snipers can use akimbo shotguns, heartbeat sensors, and silencers.
2. 7th Prestige. People who made it to at least 7th prestige by just playing, can use anything they effin want to.
3. Death. Death, you could camp, and get a 150-1 ratio and i wouldn't care cause you're that epic.