Como Funciona Hearthstone Arena Matchmaking Servers

I'm not entirely sure that the highest 2% of players' games being decided by luck is strictly tied to arena or its matchmaking. That's sorta just the nature of hearthstone, or any cardgame really. Besides, I think players should be rewarded for building a good deck.

Did you even bother to read the post or did you just skim it? They very specifically say that the "hidden mmr" (as you put it) is for data tracking only. Their arena matchmaking tries to match people based on their current arena run record. 2b1af7f3a8