well in my opinion he is.......the only ones who come close to him are:-
1. Itachi(he is the only one who can actually defeat madara):- Totsuka blade
2. Naruto:- Clear defeat i doubt but pushing him to the limits is definitely on the cards
3. Sasuke:- if not defeat but will give him a run for his money.
others i don't think even matter to madara.............
