I've never run into this on PS3, and I've played both 360 and PS3 quite a bit. I quit 360 cause mine took a shit on me, and my buddy at work has a PS3. I also had a PS3, mostly for Bluray's, so I picked up MW2. I prefer the controls on 360, but wouldn't bother switching back even though I've picked up a slim 360. So far no hackers, but ground war can still be a pain in the ass if you get tossed in to a match in progress and don't have a launcher class set up. I would suggest keeping your 360 and getting a PS3 too. The PS3 is worth it just for Bluray's and the handfull of games that you'll only play on PS3.