My mate convinced me to give it another go last night, i played online for a few hours, it does get slightly better but still pretty poor.
I can be shooting someone for ages only for them to turn round and wipe me out, im finding hip firing is the best way to play it for now.
The campaign is pretty good.
I played Mw2 last night and it was just so fast compared to it. I struggled to keep up, but after a few games normal service resumed and i was kicking ass.
Anyone wanna add me feel free. Derekmack on xbox
As for muting people on the ps3 i have no idea, but on the 360 you can mute everyone from the xbox home screen in your privacy settings. Its a bit hard to find with the new homescreen though.