Cross-realm Battlegrounds on Frostmourne.
Everyone is tired of facing full deadly gladiators from Icecrown that made their characters 5 days ago just so they can queue vs Frostmourne players and are purposely playing with less than the available for them gear.
It is just not fun having to play vs what is supposed to be our BiS items when it's so easy to obtain for people from Icecrown. They can literally buy those BiS items from the store, 12 points each or just Emblems of Conquest. A player from Frostmourne has to collect a LOT of arena points and get their personal and team arena ratings high as well. Icecrown players can also get EPIC gems on their gear. Next one - WG trinkets. The 213 ilvl ones, the Platinum Disks. Those are not available on Frostmourne, they've been added in patch 3.1. But of course they are available for purchase on Icecrown's WG quartermaster (or point shop). And since they are ilvl 213 they can be abused so you can still get cross-realm'd with frostmourne players that still have greens. I think this is enough to prove that you can't really implement a cross-realm bg system that works on this realm. I don't think that having to play vs people with BiS this early makes the game fun or challenging. It just makes trying to win a battleground pointless. Please disable it for the sake of your community, if you care that is.