Additional feedback from me here, with a question.
As for now, when the initial admiration faded, I can say that this mode has rather slow development for a mode that is there for a month. I'd personally would love things to be sped up a bit. Like additional xp for winning streaks, or xp multiplied by a fraction of a rating. Playing well should definitely be rewarded, at least inside the game mode itself, even if not outside it.
And I also would like to ask @Ryvirath. When (if) the mode will be there on permanent basis, will the drafted decks be reset every month, or the deck you drafted will be yours forever? If the second option is intended - then I see no problems in a slower pace of upgrades. However, if it is reset - then it's too little time for an average player (and I consider myself an average one ) to make that particular something work.
Hope it is possible for you to answer this question at the moment)