I said that the creator has the option to randomize teams. If you really want to work with someone else you know, simply deselect the option.

One should know that it's very hard to make a perfect random number generator, almost all have some hidden inconsistency. In fact, they sell books full of random numbers for $100 each.
http://www.rand.org/pubs/monograph_reports/MR1418/

Scroll through the "Join a Game" sections, specifically for team games. You'll see a pattern.

If you haven't catched it, it's that team one has the highest ranked players, while team two has none or lower ranked players. I assume that many scroll through pages of games, looking for a game where a ...