I'll admit, when Cursed Blade first came out I looked at this card and thought that it may have potential in a control-style Warrior deck. Maybe I should have considered that those types of decks are already so weak against aggressive decks that there's no way that they can risk taking double the damage early.
The issue with Cursed Blade is that all of the aggressive 1-Drops have 1 health and all of the aggressive 2-Drops either have 3 attack or 3 health. You're either not going to kill it in one swing or you're taking 6 damage to the face if you do.
It's a win/win for the opponent. Board control means nothing for aggressive decks that deal direct damage or have Charge minions. Hunters are just going to press their Hero Power to whittle you down if you slam into their minions with this equipped.
Cursed Blade is just a disaster and its existence in the Standard was nothing more than a hindrance to cards like Malkorok. It's one of those "meme cards," and you should be thrilled to disenchant it.