I have the full one-handed perk tree and an untempered Dragonbone war axe.I went out to find some more dragonbone to temper my armour and weapons and took out a normal dragon with 3 hits.It also bit me and I didn't lose a single bit of health,although my health pool is a 500+ so that explains that.
EDIT:This sin't a complaint,it is more of a 'What do you think' It would only bother me if this were multiplayer game rather than single player.