I thought the Treyarch games were the better ones. I might've just been lucky, but I never came across any hackers on BO2 on PS3... Only saw a couple on BO1 too. I've seen more in Ghosts over 5 months than I saw in both BO games put together.
Not going to get my hopes up with Sledgehammer just yet as I thought MW3 was absolutely ****, and we'll likely be getting another MW game.