I have the same issue. Even at 1200 rating, I keep on facing full vengeful/brutal(or mixed) teams that have 200-500 higher rating than I do.
I don't think that going afk to dodge queues is a good solution, because that's like saying "don't play the game and try to get a better timeslot later". That's completely based on luck and avoiding to play, while I actually just want to play the game at that moment.

But anyway, you used to be matched up against people that are equally strong, but since patch 2.4 you get matched up with teams of all ratings :thumbdown:
I know that I'm not very skilled (I see myself as an average or slightly above average player), but I believe that arenas are completely broken by the fact that gear comes first, then skill.