Hearthpwn

Fair point, but as I said above, it is likely that the minion summoned will be a 1 health minion, given that well over 50% of 1 mana minions have 1 health. 

 The most problematic minion of the three you mention would in my opinion be Flame Imp. AZombie Chow at a point in the game where you can play 4 mana (and above) minions will often work in your favour as it gives you heal, and the Chow is unlikely to threaten most of your minions. There are a couple of taunts that may be summoned (and as you mentioned, Shieldbearer is one of them). I have yet been able to test the deck, but I think that it would be a good idea to generally attack with the minions you have on board before playing a hungry dragon. In my opinion, at the end of the day, the minions summed for the opponent by Hungry Dragon are unlikely to constitute threats that outweigh the value of this card.