None of them is playable. Even Flame Imp has too much downside and are so easily removed on even turn 2.
Warlock can use hero power to get card advantage but that doesn't justify those huge drop backs on all lock minions. Plus if you use hero power, you drop 2 mana not just the hp.
2 mana is huge cuz even you have the card you still can't play it with enough mana.
With the Imp being pretty useless now, Lock is officially the only class that doesn't play class minion...
Give Warlock minions back please.