If you play this is, you may have run into Lag issues. I know I have. Long time to find a lobby, your bullets not hitting and being cut to pieces as soon as you see someone. All in all not fun.
My game got considerably worse since patch 1.14 and I know I'm not alone. I came close to quitting, but then I tried a game of Barebones just for the he'll of it.
The difference is night & day!! I was back to my old form, high killstreaks and quick to find a game. Even better your perks are active, it's only your strike package that is removed.
Theirs a theory that Barebones is not so laggy due to the game not having to compute for killstreaks flying around... My theory is that Infinity Ward figure it's not too popular, so haven't tried to *fix* it.
Either way, it's what I'll be playing till they do and I highly recommend it to any players who've had the same problems as me ;-)