Actually, in a great many original werewolf myths, the werewolves could change shape at will(unless they were cursed to become werewolves), and some of them even had protective wolfskin while transformed that rendered them almost completely immune to attack. Also, even the ones that were cursed usually had control over their actions, and the same goes for those with voluntary transformation. Also, curing a werewolf(if possible) would make them lose their powers, yes, but seeing as vampires are undead, curing them would just release their soul and therefore kill them, and the person who had been turned into a vampire usually did not have control of their body, seeing as they were undead.