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What the best server ?
Everyone hates his own server.
Either the prices in the AH are too high, or you can't make any money because everything in the AH is so cheap.
Either progression is shit and you can't find a decent guild, or too many guilds are progressed and you can't catch on with one because you are too far behind.
Either the server pop is too low and you can't find a group for anything(somewhat remedied lately), or its too large and you get lost in the shuffle.
No matter your faction, PvP will suck for your side on that particular battlegroup(regardless of battlegroup and faction).
Either trade chat is full of moronic children, or....nope thats pretty much it.
Just pick one at random and you will have plenty to complain about either way.
^ this guy summerize it well.