The current arena rating system allows more players to have higher
ratings in the 2v2 bracket when compared to 3v3 and 5v5. We are
preparing an in-game update that will be improving the rating system of
the 3v3 and 5v5 brackets to allow all three of the brackets to have a
similar number of players able to achieve ratings on par with what’s
currently possible in our 2v2 arena bracket. As a result, we are
changing the personal and team rating requirements for the item level
239 weapons from 2200 to 2350, but keep in mind the tooltip will
continue to show the requirement as 2200 until patch 3.1.2.



As a result of the above improvements, this change will prevent an
excessive number of players from reaching much higher ratings and
acquiring the highest grade of weapons in-game. The increase in rating
requirements is designed to keep the number of players able to obtain
these arena weapons on par with the number of players who are able to
obtain the same grade of weapons from Heroic Ulduar.



When Arena Season 7 launches we plan to return the highest rated season
7 weapons back to 2200 while also ensuring that the difficulty in
achieving that rating is closer to what is intended, yet of similar
difficulty for all brackets (rather than being easier for 2v2).


So more rating for wins

Currently
2v2 teams over 2350: 250

3v3 teams over 2350: 22

5v5 teams over 2350: 0