Why do some people here think that the sharingan/MS is unbeatable. I think someone like Gai who sparred enough time with Kakashi can deal with the sharingan.

Also, I think a very skilled blind ninja is not susceptible to the sharingan's genjutsu. I don't remember being introduce to any blind ninja in Naruto but think about it. MS can lead to blindness and blindness can lead to beating a MS user. Oh irony.