Yes x1000000.  I can't even begin to explain how frustrating that is.  It sucks the fun right out of the game, after 3 games in a row of 3v4 my brother and I had to stop playing.  In those 3 games, it only added a new player once, and he left right away, which raises the question, if you're going to allow drop-in, drop-out, why aren't you using it?  There's got to be 1 random person looking for a match that could be put in the game?