OP,i don't agree with your MTG statement from the beginning. Hearthstone, in its "simplicity", doesn't allow true interaction during the opponent's turn. This means that *every* kind of powercreep they introduce *will* be unfun to play against. And that's why people cry for nerfs - because they want to have fun,not be frustrated.
In MTG, there is a lot you can usually do to play against most things, and this makes it fun. Nothing appears as broken, except when they do some mistake and print something really overpowered that everyone starts to play or has too high win rate.
In HS, the design philosophy, since the game launched, gated (and is gating) them into a corner every time they print some new cards. It's a complete binary system - you either have fun playing something and winning, or you completely hate playing against that same thing, at least after some games.
And they simply refuse to move away from this powercreep stupidity every time they print cards. It's like they are adding more inflation to their own savings account, knowingly.
What would be ideal? More interaction, having a counter printed along with every powercreep possibility, buffing the rest of the classes and archetypes or printing cards for them too, giving up on the whole powercreep idea and making all classes have at least one viable archetype each expansion(win rate around 55% on most brackets, not only high legend).
Sure, since it's all a zero-sum game, someone must lose. That's perfectly fine. I'm not asking for EVERY archetype from EVERY class to be viable. You can have a viable control shaman but have a bad control warrior. Split them around.
Instead of making the game more complex, they went and complicated everything else - brackets (each with their own cry for nerfs and life cycle and card viability), extreme card simplicity mostly, not adding more keywords because morons can't read the explanation text, the market target being teenagers, etc.
All in all, for HS to change we need someone capable of ripping it apart and moving the design in a new direction, that doesn't apply inflation to the cards' power every new set. That's the hearthstone i'll play. Until then, some BGs will do just fine, until I get frustrated by the same stupid gating they force in this mode too, and the unfun gameplay for the bottom 4 people.
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