Article by Nydra over at Gosu Gamers
There is actually a lot of focus on the randomness of the card effects but what I definitely agree with are these quotes:
"GvG didn't give us more deckbuilding options. It only gave us more auto-includes."
Firebat brought up about the prevalence of Piloted Shredder, Loatheb, Sludge Belcher and Dr. Boom and you can just check out the recent Viagame House Cup #2's card stats to find out more. (It includes decklists used too) Those cards all have above 55% appearances in decks which is huge. I don't know how Blackrock Mountain can improve that aspect of the game as any new and powerful card will simply replace the previous card in the same mana cost slots and we are back to square one again.