Nefarian felt a little favoured, 60-40 maybe, with the ability to win early but still having chances in the late game depending mainly on whether he gets useful cards with the hero power. although whether or not it's perfectly balanced doesn't bother me at all. The sheer amount of randomness must make it very difficult to balance. I won one game as Nefarian with a silly finishing combo of Unstable Portal drawing Auchenai, comboing Cold Blood on a minion on board and then playing Auchenai - Healing Touch for 8 damage, which makes the whole brawl mode worth it in itself 