#0 - Jan. 21, 2009, 9:49 a.m.
Blizzard Post
With the release of patch 3.0.8 we have implemented a new matchmaking system for arenas that will improve the overall system and help ensure that players will be matched against others of equal skill. The new matchmaking system uses a rating that you cannot see, and is separate for each of the arena brackets.

The rating changes at the end of each match are affected by this new system, and as it just came out, there may initially be some odd behavior in rating changes, but these will straighten out fairly quickly.

We will monitor this new system and update it as needed to help provide the best experience possible in arena matches.