People keep saying that COD players want to play at home on screen and that it will fail on Vita, but I think it's being underestimated.
This is COD we're talking about, it's more popular than oxygen.
Plus, individual games are short enough to have pick-up-and-play value for gaming on the go.
A proper portable COD experience could be massive if the "I have to get it to play the latest COD with my friends" effect kicks in.