Perhaps a refinement on stats may be in order (I don't know), but I think the skills should be redone. The current skills listed doesn't seem to bring much uniqueness or playablity to the Werewolf.
Weak scouts during day, brutal savages at night, sounds like a good concept.
Werewolves are between a decent line between beast and humaniod monsters, so this may pass for the ''Too Many Humaniods'' issue.
Howl may be overpowered, a Keeper drops all of his units, Werewolf howls, and his whole line of defense runs away in fear. AoE stun is also an issue.
Berserk seems a little pointless to use, and it requires level 10.
Werewolf Curse (Infectious Bite): Sounds ok, but maybe should be refined a bit more, like a passive % chance to pass it on (% chance = to level), leaves a debuff on the vitcim, if he/she surrives and is not cured, turns into a werewolf hostile to all factions (Can be cured via placement in Temple).
Sounds good, but may need to be thought out a little more. Hope this helps.