The reason I'm getting MW3 is because I still want some of that adrenaline styled gameplay.
Old habits die hard.
This. Honestly I don't even find BF3 all that great everyone says it is. It's funny how BF3 fans watch and comment on every COD video. Also I found some ways to enjoy COD if you hate it for some reason.
1. If a guy kills you, deal with it. Who cares what he kills you with, just deal with it.
2. Play some gamemodes with objectives. You'll find they get intense.
3. Play with friends and use the headset.
4. Fool around sometimes. Challenge yourself. Ex. "Well I can get a 5 kill streak, let's try to go for a 7".