Hearthpwn

Mage or Hunter probably LOST the most, mostly because like... mage didn't really have any particularly bad cards in it's basic/classic set. Hunter got hit slightly worse but still lost a lot of the direct damage tools it relies on.

Having said that, there's lots of current mage/hunter decks that are powerful, are surviving the rotation, and don't rely on the classic/basic set very much at all.

Also in terms of overall power, I think the druid core set is the weakest by far. There's some neat cards in there, but most of it's either redundant or just serves very little purpose. It's also like... I don't know what it could add beyond what exists in the Year of the Phoenix already.

Druid has some cool beast synergy stuff, but Druid of the Claw isn't a beast in your deck. Innervate is kinda neat, but either compounds with Blossom too much to create this weird critical mass of free mana in one turn, or it just feels weaker.  Enchanted Raven is super boring and Phoenix has way more interesting one drops, Mark of the Wild still seems bad, I feel like Druid has enough treant generation without Force of Nature & Landscaping. Wild Growth is just worse than Overgrowth and feels redundant. Nourish is REALLY weak, and just seems outclassed by other drawing options. But might see play if there's literally no other top-end card draw. 6 mana is really weak just to draw 3 cards, though. Feels like that could have been bumped up to 4. And then Cenarius's treant-summoning effect is SO weak. Especially for an 8 drop. The board buff is good, but I feel like the treant effect could have summoned 4 treants, or maybe given them rush or something.

Again, I don't think it's weak necessarily, it's just SO anemic.