I've writing about this a lot but last night I was just about at the end. I was playing the VERY fine Assassin's Creed Brotherhood multiplayer and I was in a great group.  Very well balanced, no one really dominating; just going along.  It was awesome, we played two games and then people started quitting.  Over the next 30 minutes I spent waiting to have 6 more players to start another game and then when I couldn't find them; I waited another 15 minutes to start a whole new session which never happened. 
       I've totally given up on Dead Space 2 Beta. 
            I know these exclusive betas are supposed to be marketing schemes but when you can't get enough people to play because it's too "exclusive" perhaps the marketing isn't worth it...