Or rather, is the Sharingan too haxed? I mean, seriously. The Sharingan by itself is already pretty powerful, then there's the Mangekyou Sharingan. I didn't really think the MS was too bad for a long time because you have to make eye contact to use Tsukiyomi, and you have to be able to see what you wanna hit with Amaterasu. And despite it's destructive power, it has the same downside as any other technique... it can be avoided. A good way to avoid both of these techniques is to blind the user somehow, like throwing dirt in their eyes or something.
However, here comes Susanoo. Now while it's still pretty much a mystery, it seems invincible so far. Not only does provide incredible protection for the user, but it's basically a one-hit K.O. Until we learn more about it, the Mangekyou Sharingan is officially haxed.