I've just played a second game with Quiche Poireau -- the guy who only builds cobalts.  It's kinda funny and sad to watch at the same time.  I think he irritates his teammates more than he does the opposition.  Somehow he seems to beat noobs, but that's not saying much.  I remember playing a competitive 4v4 against tough opposition (Violator666, FourKingHigh, I think Mantacore was in it, and someone else) and my team was screaming at him to build better ships.  He could have been easily squashed by one of the opposing players but he was occupied with the rest of us.

So...if you're playing against this guy--watch out for the mighty cobalt fleet!