Board Thread:Naruto Discussions/@comment-12509038-20140902023453/@comment-24514198-20140902162540

Maybe to manifest Susanoo, an Uchiha needs to unlock two different powers within their eyes that's unique to the individual - Itachi: Amaterasu + Tsukuyomi, Sasuke: Amaterasu + Kagutsuchi, Obito: Intangibility + Teleportation. I got no clue on Shisui and Madara though.

To the original question, I think Susanoo is the best thing to ever grace the Uchiha's dojutsu stack-list. It really allowed Sasuke to compete with the strongest shinobi out there. The few problems I have with it though are that, its stages in which it develops need to be fleshed out more effectively. Such as, if one's chakra-pool enlarges, then it allows the user to access more stages, until they reach the pinnacle: Perfect Susanoo. And the other gripe I have is that, I wished it would have stayed as a last resort trump card.