Not sure if this is a new feature. or if you only get to rate decks after after a set score, anyway in my silver grinding I now get to rate all the decks that beat me, as the only decks that beat me are ghostmares, they all get a thumb down...very boring.
ANY non GM deck that beats me gets a thumbs up (only 2 in the past few days)
I just played an excellent deck, it was a long hard fought battle with lots of changes in who was on top that i just won with 3 cards left, but I don't get to rate it, shame
