WARNING: OPs post is 100% unadultrated bullshit. not 99%, ALL OF IT.
There are two freaking stickies about this in the PVP Forums.
Does each player have a single MMR rating, or a different MMR rating for 2v2, 3v3 and 5v5?There's a separate MMR for each bracket (2v2, 3v3, 5v5). - Kalgan, LEAD DEVELOPER
World of Warcraft - English (NA) Forums -> AJ Repost #2
like its hard to do it the legal way :s
Kissemisse
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If you're not going to bother to click the +Rep button, don't say you will.
How come a Blue poster (read: Blizzard) states that the hidden ratings are not connected in ANY way, and that there are 3 different hidden ratings, one for 2v2, one for 3v3 and one for 5v5. There is just no reason they would lie about that, and they have also made several blue posts explaining the hidden rating system more detailed.