Yogg Saron is hilarious. I've only see it do something good for the caster exactly once. I just saw it cast Brawl and eliminate the board to his own one health minion followed by Whirlwind and then a bunch of spells that are supposed to target minions.
Half the time my minions get buffed. I am imagining I will never bother trying to get this card, what a joke.
So far I've had pretty decent luck with a homebrew Blood Knight Paladin and a homebrew Pirate Warrior. Obviously the C'thun net decks are tough contenders but most of this RNG garbage is pretty easy to kill. I am really enjoying a new meta without overly dominant decks (yet) a lot more than I thought I would. I have not even tried Wild yet. My arena winrate is suffering pretty badly, though.