I know the assassins creed one isn't very good.

c&c please

They are all pretty good, although very similer.
It seems in the first two as well as the last, you use the exact same effects, down to focal and text placement.
I would simply suggest trying out different things, don't use the same technique for everything, or they will all look bland.
Also, I would suggest not to place your focal in the direct center of your signature.

Will try to go for something else on the next one i make then