If I were to pick a favorite new hero, it would definitely be the Warden. Fan of Knives is ridiculously strong, and Shadow Strike at level 3 does 225 damage and another 150 over time. I can’t forget Vengeance, either. THAT’S one of my favorite moves. I wouldn’t have been able to stop Illidan’s summoners without Vengeance.
The runner up would probably be the Blood Mage. Flame Strike is definitely one of my new favorite moves, as is Phoenix. Banish is also good.