He was too powerful everyone. Hence why Masashi Kishimoto removed him.
With his Rinnegan's full power, he could create 5 Limbo that each cannot be seen or sensed by non-Rikudou Senjutsu or Rinnegan wielder. And they cannot be hurt without Rikudou's Chakra either. Each Limbo can act as defence and offence position, making sure Madara doesn't get harmed. And in case if he was, he would simply switches with the Limbo to save him the damage. And as shown, Limbo cannot be killed as they are in another dimensional plane; only way is to seal them off with powerful Fuin. Aside the fact Limbo is so OP, he has the 6 Paths abilities. Preta Path to render all Ninjutsu based-Chakra useless. Human Path to instantly kill off anyone in physical contact. Asura Path and its rockets at the hands of the original wielder, possessor of Rikudou's full amounts of Chakra, and Juubi's Chakra as well, would potentially destroy islands. Deva Path to manipulate the forces of gravity; simply levitate anyone he likes, or pushes away titanic proportion of earth, given he's Juubi's Jinchuuriki, the only one aside Hagoromo to use the full power of Rinnegan. An example was his Chibaku Tensei, which he refers as ''raindrop''. And if he needed to end the match quickly, he could activate his Rinne Sharingan and use Infinite Tsukuyomi, which only Rinnegan can counter.
His Six Paths Senjutsu is highly above Naruto's, since Madara's originates from stronger source of Rikudou Chakra and stronger Senjutsu (Hashirama's + Juubi's). Naruto alone could blitz the likes of Kaguya, so imagine Madara who is faster would do. His reflexes and reactions allowed him to keep up with 8th Gate Gai, who could literally distort space/time physically, which theoretically no one could reach to such speed. To put it all simple, Taijutsu and Ninjutsu is all useless to Madara.
Add the fact he could combine Juubi and Perfect Susanoo, very much like he did with Kurama, you have infinite destructible power. Sasuke's PS enhanced by the Yin Chakra of Rikudou's, could do
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. Madara possess both
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, as well as Juubi's Chakra on top of it. In other words, Juubi could do
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, Naruto's & Sasuke's combined power could do
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; multiple both AOE, and this is the power when Madara's Rikudou PS and Juubi's form fused together.
The only ones I could see giving Madara a true fight, is Jinchuuriki Hagoromo, Kaguya and Hamura together.
