Looks pretty cool actually. (That C4+barrel bit was awesome.)
The co-op campaign bit looked nice.
I also like how on Playstation you can send invites to friends who don't own the game and they can still join you. (Presumably after a download of the necessary aspects of course.) I've never seen anything like this on a console before. (I mean I've seen it on PC like when Blizzard used to allow players to install part copies of the game, without needing a CD key, to other PCs so you could play online with them.)