2 reasons why there is some truth to this statement...
1. People on XBL pay to be there. PSN is like a club where everyone can join...as many times as they like...hence you can't do any proper skill matchmaking. Whats stopping a 3 star general in Halo 3 to create a new account every month on PSN and rape people over and over...other than the fact Halo 3 is not on PS3 :)
2. XBL is a controlled environment. Microsoft controls the cheating and hacks and Valve doesn't have to deal with that. PSN is controlled to a certain extent but not as much. COD4 had a huge issue with cheating few months back and IW had to take matters in to their own hands and do up a a patch.







