A few tweeks could actually get me back into Cod.
1- Take the K/D stats out of the game completely, no one cares and it means fuck all in real life. Grow up!
2- Take the killstreaks out of the game, they promote smugness and camping.
3- if you are going to have ks, go back to the old 3/5/7 system
4- Dedicated servers, honestly, people are throwing enough money at this shit, provide them with some quality for once.
5- Take corners out of the game, I've played enough of MW2 and MW3 to realize that the game is infested with campers and corner dwellers.