Wielded by a force user yes,but could GG? I don't know if its because of the lightsaber or because of the power of the person.
I think its the person because Mace had a very hard time blocking Sidious his lightning, but Dooku his much weaker lightning was easily blocked by Obi.
And even if it could be blocked then he can use another technique in the force to kill GG in one second.