If the mention of a single-player mode sold a lot of people on the game, the mention of it being a full retail title turned me off to it. A $20 eShop primarily multiplayer game would have been fine, but I don't want to pay 60 bucks for something like this. It might be different if the campaign is huge and amazing, but I get the feeling it will just be playing against bots.
But then, I'm a cheap bastard, so...
Currently playing:
Bloodbath Paddy Wagon Ultra 9