I'm on Aggramar with quite a lot of other Multiboxers. The server isn't really good at pvp or pve, but the Blackout battlegroup is good. Alliance wins AV most of the times. Queue's are 5 mins at average. WSG/AB/EotS are crap, alliance only does those for marks to buy items in general.

The only real pro is that we're with more multiboxers. We only got a few guilds in the beginning of SWP and most hardcore pvpers tranfer off to other servers with more active PVPers. 2 horde teams moved to Dreanor (blackout battlegroup aswell) and continue their business there. So that's an example of how Aggramar isn't really great for hardcore PVPers, but Blackout is good

So arena competition is good. 5 min queue's on AV, other BG's are pretty much instant.