Jumping on this caravan a little late but probably worth the $50 and boosting a class to 90. Any specific classes horribly underperforming atm? I've done Priest, Paladin, DK... looking for dps. Usually partial to healing in PVP as well ... was thinkin Shaman for Ele/Resto or Druid. Feel free to throw out some opinions.
No classes are really under-performing at a level that is detrimental to what we do. We don't do Mythic raiding and probably never will again after the implosion, which is where you'll most likely see class stacking and certain classes being left out completely.
I don't know if you're planning to join the minivan on Saturday mornings, but if so we've been having a pretty severe lack of ranged recently. I say this with some trepidation only because last time I said we didn't have healers, the next raid we had like 7 healers. We have a lot of hunter gear rotting as well as a lot of caster gear rotting. A mage, warlock, hunter, balance druid, hell even a shadow priest would be great additions. We tend to run a bit melee (WARRIORS) heavy.
That said, I wouldn't turn anyone down for a raid spot right now regardless of the class. The only real exception right now are tanks. Poid and myself usually do all the tanking and Antidotes was able to fill in quite beautifully one week as well. I've meant to funnel tank gear to other people, but haven't gotten around to it. If someone played a main spec with an offspec tanking set that could be nice with my baby on the way.
If you're looking to heal, right now every saturday we usually have 2x resto druids, 1x pally, and 1x priest (or 2x, sometimes) show up. I'd actually really like a Monk healer, but Draegan switched to Warlock. A ele/resto shaman could be nice too, I just think a bunch of the fights are movement heavy and might be difficult for an ele shaman. Druids are pretty king at healing too.
Sorry that was a very disjointed post and probably didn't help. Play what you enjoy, we'll find a spot!