The problem about BRM is the missing synergy. Because Blizzard mixed non-dragons with dragons and this does not went well. Also the lack of neutral cards in BRM is another reason for it. While Naxx had a lot of neutrals, BRM hasn't.
If all cards in BRM were around dragons and synergy and if blizzard decided to make only 1 class card and the rest neutrals, it would have been better. Dragons simply lack of Synergy. Dealing 3 damage and getting +1/+1 with a card (and killing a legendary) is not enough! Blizzard only needs to add more dragons and synergy, then it could finally work.
It's 4 damage, not 3. Also don't forget the new minion that allows you to use your Hero Power twice. Yes, the stats are meh, but the effect is insane. Also a 6/3 trade in the worst case with almost everything between 3-6 mana. Also for priests it's easy to buff her health if necessary.
Also allow to heal for 4 health in the lategame can be very insane; especially at 10 mana you can almost use it on every turn, and this can occur in insane healing effects.
4 healing or 4 damage with auchenai, and that maybe even 2 times can be a big difference. Still it is not enough against facehunter, because normally you are already dead on turn 6 if you put her on board, so we need more.