I know a lot more play on xbox than on ps3 or pc, so I'm curious how many there are. On the PC there are usually about 4,000 in the core playlists during peak hours. --- I enjoy the multiplayer of the Call of Duty franchise. Its accessibility, depth, and fun is unmatched by any other shooter.
I think there are more players on ps3 at any given time tbh. I've played the older COD's on there and whenever I would check the counter the # of people online would always be above 360's. Probably helps that the online is free.