after player some arena matches, I have noticed that even when you're at 1600, you face some teams that are even 1800 or 1900. It's pretty ridiculous when you lose, since you lose about 30 or so rating.
Patch 2.4.2 [quote]Arenas If a character's personal rating is more than 150 points below the team rating, they will earn points based on their personal rating instead of the team rating. If the average personal rating of the players queuing for a game is more than 150 points below the team's rating, the team will be queued against an opponent matching or similar to the average personal rating.[/quote]