SK-Gaming.com recently added a "Global Player Ranking" built with data pulled from the Official WoW Armory. They do an excellent job of manipulating the data into some useful info. Something that stood out was the lack of Shaman in the top 100 players group.
I read some more about Shamans in the Arenas, and I'm starting to understand why. First off, these numbers are based on the average Arena Rank of a given player, including their ranks from all three Arena Brackets. (2v2, 3v3 and 5v5)
While just about every top Arena Team in the 5v5 bracket has a Shaman in it, the 3v3s and 2v2s are a different story. Shamans can either head into an Arena ready to heal, or drop crazy burst DPS. Healing isn't normally an option, because the other healing classes simply have more to offer.
That leaves burst DPS. While Shaman can do this well, once again there are much better choices for DPS when you have such a small team as you do in 2v2 and 3v3.
I plan to play in all three brackets when I hit 70. I'll likely follow in Alley's footsteps and take 4 of my boys in at a time, and bring a 5th dedicated healer. But I hope to run 2v2 and 3v3 on my own, and see if I can't make some progress.
I don't intend on even hitting 1800 in the lower brackets, but I plan on having fun. :)