Easy way to tell if there IS life in your game is to open the scoreboard (TAB) and see your ping to everyone.
But, yea, i got matched up 3v3 with all AI computers and 2v2 with all AI computers.
Oddly enough, i was in a 4v3 match, with the 4th guy being an AI computer.
I generally leave those games because, if i wanted to play against AI, i'd have played singleplayer!