I honestly have to say, *shock horror*, that I am not overally impressed with this game. As some of you long-timers know, I've been a fan of the game majorly since COD4.
It seems as if they have adopted Black Ops net code and shoved it directly into MW3. People should know that there was always more lag in BO compared to the other CODs due to theater mode and some tweaks here and there, so a full bar connection isn't guaranteed to have spot on hit detection. MW3 seems to have adopted the exact same thing.
COD4/WaW you could tell if will be a crappy game if you're on anything below 4/3 bars, but BO/MW3 this isn't necessarily the case. It was just bareable in BO because the game was slower paced and the maps are bigger so you had a second chance at hitting someone more often. But MW3 not so much so...
Things aren't helped with me only really playing Hardcore Search. There is absolutely NO kick system for team killers anymore. You can rocket your whole team at the start and kill everybody, every round, every time, no punshment apart from a suicide. Black Ops and MW2 you would only kill yourself, and Black Ops kicked after killing a few people. WHY DID THEY REMOVE THIS?!?!
I'll only be playing this causually from now on due to these reasons. The team killing may get fixed but the lag compensation probably won't, shame. Guess I'll just have to deal with it or play Battlefield 3/ Homefront which deal with it better.
/rant