The thing is, they got Eidos Montreal to do it, who made Deus Ex HR, so they are clearly a decent studio. I guess they just didn't really put much effort in? Having said that, I wouldn't write it off quite yet, we assumed that AC, Uncharted and ME would all have rubbish multiplayer and they were actually rather good, there is still a bit of time for this to be fixed...
Oh well, the single player looks perfectly promising for me and I don't need MP to convince to buy the game