In our battlegroup, horde lose every wsg, ab, eots, and win 60% of av.
You also lose every arena game 1600+ in 2v2, 1500+ in 3v3, and 1600+ in 5v5 unless you have full season3 for every member.
i'm in your same battle group, i agree with you about the bgs except wsg... we dominate that...
my priest got 1850 the first week of s3 when he was in 3/4 blues...
my druid just got 2k last tuesday, wearing 2 pieces of s3 (he's been 70 a little over a month now)
i think this battlegroup is fine, gear doesnt mean anything if you dont know how to use it
edit: shamans arent the worst class, get a good warrior or rogue or hunter or warlock... if you were resto... Enhance aren't exactly the best type for 2v2... Enhance shaman/mage is a pretty decent team