Man funny story I play this game daily and never stopped playing daily since the demo last year and it took me 3 days to beat the collectors. I beat everyone else day one on all difficulties and could not find a team who could beat the collectors until the last day. I have a lot of good friends at the game it was just hard as hell.
I wish I've been playing it non-stop. There are so many characters and weapons I haven't unlocked yet that I wish I had.