All these Hearthstone tournament formats kind of suck. There's not too much strategy involved in picking your decks, because it's basically just glorified ladder play.
I would love to see one where players built their decks on the fly, and were able to more sensibly tech against each other. One player chooses a class, and then the other player chooses a class, and then they both make a deck (in secret). You'd switch the order for the next match. That would allow you to tech in appropriate cards for a change. And skill as a deck builder would finally come into play, as well as your knowledge of your opponent's tendencies and preferences. Would make for more interesting games, I think. Has that ever been tried?