Hearthpwn

DeathKnight Fun and interesting but a very slow card .  Decks like Pirate warrior , Token shaman and Murloc pala usually end game before turn 8 .  

I can't see any new cards that is a good anti aggro except Defile which is a warlock card again warlock is dead class . 

Lifesteal  -  Can't see it being that good enough to slow the meta down 

Druid of the Swarm
Spreading Plague
Righteous Protector
Spirit Lash
Shadowblade
Voodoo Hexxer
Avalanche
Defile
Drain Soul
Blood Razor
Corpsetaker (with Wickerflame Burnbristle's keywords)

None of these are slow, most are expected to see substantial play, and they're all fantastic against aggro. I don't think the meta will slow down much, but you can't say that Defile is the only good anti-aggro card. That's just wrong.

Take a closer look at the cars, there are great anti aggro tools, even now without the expansion to fight off aggro is an easy task.