Mh, I don’t know, I have mixed feelings about RotB.
I think the expansion contains a few egregiously broken cards, but other than them the balancing looks fine overall. I can’t tell exactly what is causing troubles, but it seems to me that the meta is more polarized than before. There are a few “extreme” aggro decks and a few “extreme” control decks which hurt fairly reasonable midrange decks.
I think that playing meta decks is more important than ever before. Also, I have more often a feeling of rock-paper-scissors about the matchups, likely because decks have become more efficient with RotB. This efficiency often makes one lose matches which were apparently won, due to stupid bursts from hand or lucky draws, which is frustrating. I’d like the power level of the cards to be toned down a bit and I’d love to see encouraged strategies which do not require board spamming.
That said, the game is still fun for me.