The biggest problem right now is that AT and RT can play each other... the line gets fuzzier in 3v3 and 4v4 since anything less than 3 or 4 players is technically "RT".
I started thinking that too after I was done. But then I thought, there's going to be a lot more leagues if that happened. If only RT's played eachother and vice versa.
I did hang around after one of the losses and talked to the other team for awhile. They were arranged and thought we were too. During that match, my partner asked me at about the 12-15 min mark if i was new. I said no, then promptly left.
Perhaps changing match values when there is an arranged team versus a random. With giving the random team extra points in a win, or not as many in a loss.
If you all haven't heard yet. The beta is getting extended past the 1st. Now going until Monday the 8th.
SarCraft 2 Beta test schedule update