2 different teams, controlling different characters with different skills, attempting different objectives simultaneously. Asymmetrical, just like L4D. Symmetrical shooters are TF2, CS, CoDoodie etc. Pretty obvious.
As for the notion that 4v1 isn't "fun"... well, it's hardly 4v1 in the traditional sense, considering the 1 is a ridiculously more powerful monster than the 4 regular players in every phase of the game except the first ~minute of the match. So... yes... I suppose if you play by yourself all the time then a Co-Op team shooter is probably not the best use of your time. Just like pubs got consistently steamrolled in L4D if you didn't have a few friends to play with.
I was in the last beta, and this game is tons of fun. I'm just disappointed that it's "yet another next-gen" game dropping DX9 support for no reason whatsoever.
I'd feel alot better about the netcode if it was not running on CryEngine. Source (L4D) may look dated, but backwards compatibility and netcode were things it never, ever, ever had a problem with. It's just sad to see the new console generation being used as an excuse to stop developing DX9 completely (which really doesn't follow in a logical sense since they are still making 360/ps3 versions of the game like shadows of mordor did).