Well, he's strong.
But imo, what make him a lame villain is kishi unable to kill him, thus resort on kaguya ex machina. That's lame.
I mean look at aizen. That's how shonen villain done right.
did he bring the both the mental strength along with the physical to the hero?
because to me, nagato's the perfect villain. everyone after him just feels "been there, done that."