Yea i switched to ps3, tho it is not better at all. It does contain more noobs imo tho >.<.
Mw3 is horrible for experienced players for these reasons:
support, Assassin, death streaks, and lag compensation.
Those few things right there, especially the lag compensation kill my experience online, especially if you get destroyed in many gun fights you should be winning.
I got a decent k/d over a 2.3. Im playing infected to launch my winning ratio, because you pretty much can't lose unless someone stays alive the whole time and you are on the infected team. Atm at a 103 game winning streak.