I don't know about you guys, but this is potentially the game in which I've heard people on the mic the most. Already.
Seems like every 3 or so matches, someone's on their mic. Online games on the PS3 have always generally been pretty silent regarding other players. Silence can be a good or bad thing, but I think mostly good, judging by the 360's example.
Though it can be hilarious to hear people's reactions. The other day I killed all 3 players in a FFA with Drake's level 1 and one guy simply went "Ohhhhhhhhhhh!" And earlier in a 2v2 some guy was complaining to his partner about the barrels I kept throwing about. Lol.
Awaiting: Bioshock: Infinite, The Last of Us, GoW:A, Amnesia: AMFP, Watch Dogs, NS: UNS 3 Playing: Playstation All-Stars