I'll add a few things but yeah. They are currently much too op, there should be a lesser form of them for players to play, they shouldn't be stronger in human form, and should have drawbacks, maybe the Lycan becomes infertile?
It ages badly and becomes some twisted ugly guy? Maybe it ages faster? Perhaps they slowly go crazy, mad? They should have to replenish they're powers with something, a bit like a ghoul needs to eat flesh?
Perhaps they cannot survive in hot desert places? Perhaps they can be tainted and corrupted, hence making the gold weaponry usable against them, because as of now, there's no real reason, unless the transformation slowly taints them in a way or an other, making them slowly evil? These are some ideas of mine.