Simple tip here, don't play while you're pissed off if you don't want your K/D ratio getting hurt or anything like that.
I had a couple of bad games, gradually got more and more pissed off, but didn't quit when I should have, just kept trying to undo the shitty games and in the end just ended up having some appalling games.
Hate it when I get these random slumps for no reason. Everything feels like it's against you as well. Everytime I felt like I got a good kill, they'd end up being a second chance noob, and I'd either die, or someone else would steal my kill. Encountered a lot of random campers today too.
OT but anyone trying to go for a nuke in MW2 doesn't have a better opportunity than to do so now. I got my first one on scrapyard yesterday. Went 35-3, had the regular 7-11-25 along with scavenger, stopping power and commando. There's plenty of noobs on right now cause lots of people recently bought the game due to all the blowout sales.