"You automatically lose unless you look up the answer" is such stupid game design.
I was expecting the lich king fight to be shit and even I am surprised by how terrible it is. Blizzard will always go lower than you expect.
Which class needs you to look anything up? I didn't plan on doing so unless I was completely stumped. I've only finished Priest so far and outside of taking way too long because I was stubbornly trying to win with an Inner Fire deck at first, it was easy. Played Mage once or twice and that's a rough opening, but I'm not sure what he follows it up with later on.
Outside of the opening salvo unique to each class, does he play the same and run the same cards?
Probably the same cards, but the opening spell is different for everybody.
So if you decide to try Miracle Rogue and your spells all get nuked, you have to make something else. Forced FAQing is a garbage design decision.