his genjutsu is superb it brought kakashi down in 1 second and he has the sharingan, everyone else that doesent have it would be in even more serious trouble even if they are insanely strong
madara himself said he would have been dead if itachi knew everything about him and was glad that his eyesore was finally gone
and above being insanely strong he had his susanoo which stoped kirin, while it destroyed half a mountain and is the only known S rank lightning jutsu and has his yata mirror and the totsuka sword which is suppost to make him invincible, even the amaterasu was enough to ''bring down'' the 8 tails, and if it werent for the substitution tentacle it would have worked
i dont have much time but i could go on