Figured I would try this out, been having some fun with Rogue. Gotta say, I hate constructed. Arena can be fun.
I think I pinpointed why I hate Mages/Priests, and spells for that matter. The (arguably only) thing that's really fun about Hearthstone is managing the minions, using their attack/health combinations and varied traits to efficiently gain control and options. Completely goes out the window for a Mage, who can spend the whole game with their finger in their butt reacting to whatever their opponent plays, coming out with a card advantage. Playing a minion means thinking about how that minion will trade with enemy minions, ways the opponent can react, and building towards some kind of a plan that synergizes with what's in the hand/deck. A spell just ignores all existing minion mechanics, and instantly reacts to the current situation, rarely with any need to care about the next turn or the overall strategy for the match. The game would be much better if the focus were heavily shifted towards minions, IMO. There's some other incidental stuff like the existence of pyroblast and the laughable mana cost of shadow word cards, but at its core I think spells should be made much less efficient and viable.
Rogue doesn't feel as braindead since spells usually need to be combined to be effective, and they lack the easy-mode two damage AOE so many other classes have. I also like the emphasis on weapons, which feel much more balanced than spells.