I had a great experience with the newbie mixes. I told everyone it was my first ever 6's match and no one bitched at me when we got rolled and my roll outs sucked. After the match, the coach spent about half an hour going over roll outs with me.

My only complaint, and what keeps me away, is having to sit in mumble listening to everyone while waiting to get picked and having to yell your name to get picked although I'm not sure of a way to improve on that.