I feel part of the issue is more constraints on utility creatures. M:tG in particular gives itself more complexity to play around with through activated abilities, which I doubt will enter Hearthstone anytime soon.
None of the cards revealed so far feel like keystone cards, meaning cards you explicitly build a deck around. Mana Addict is a keystone. Grim Patron is a keystone, I'd argue Mechwarper is a keystone. Odds are I'm underestimating Inspire, but I've yet to see something that makes me want to try building a deck around it.
It's true, eh? We haven't seen anything that really encourages you to make an inspire deck. All it takes is a couple or really good inspire cards. With those in existence, all the inspire and inspire support cards shoot up in value. If they think cards like Coldarra Drake are going to single-handedly make inspire work, then they are mistaken.
I think the closest "keystone" card we've seen so far is Frost Giant, but mainly for Echo Mage. That's cool because the Giants in general push for certain playstyles and have helped create some powerful deck archetypes in the past (Molten + Mountain for Handlock and Sea Giant for new Imp-losion style zoo). Frost Giants keep their lowered cost when copied with Echo Mage after all, and work well with Duplicate and Effigy. Unfortunately getting good value out Frost Giants takes time and needs support from cards like Garrison Commander, Fallen Hero, and maybe Maiden of the Lake to pan out.
It might still be too slow and not a very good deck, but low-cost Frost Giants is at least a dream that can be aimed for throughout the continued lifetime of Hearthstone.
Dr. Boom annoys me in general.
I like Dr. Boom. It goes in every deck and takes up an expensive minion card slot from every deck, which otherwise would have been a less versatile legendary in many cases.
Yeah I guess its not so bad to have a generic high mana value card that fits in most decks. Ragnaros just doesn't cut it anymore, though Sylvanas also works in lots of places.