Noticed today that the filter does not work or does work but doesn't work as the games are not reporting correctly the number of people already playing.
On the game listing screen games were listed with spaces up to 4pr 5 available. On the Join screen they showed full. Back on the listing still showing spaces available. Tried this on several listed games and got really frustrated.
Also the game listing doesn't have filter by ping or display any ping at all. I would always select a game with low ping on Warhawk and hoped Starhawk had this feature but so far nothing.