I've only played multiplayer thus far, but I have to say, it's really fun.
Manhunt mode is great, its 4v4 where there's the hunters and the hunted, and hunted can't fight hunters unless the hunters like make themselves obvious.
It's really fun.
Just a warning to anyone thinking about getting it; you might want to wait if you care about achievements or trophies.
The game is glitched such that they don't work for a large amount of people.
In multiplayer it's not so big a deal, because you can just get them later.
But for single player, if say, your sequence 4 trophy doesn't load...you have to play through the whole game through sequence 4 and hope it does, since the game is an auto-save affair, like the previous one.