Nah he only pulls it out against high level fighters. Madara was the leader of the Uchiha clan. im sure he knew Uchiha secret techs like the ones obito used. His kkaton took a squadron of water styles to put out. Id say hes beast even without susanoo. Although he needs it to go against kage shinobi
Bold: According to this base, Obito showing any uchiha technique is fan fiction.
On topic: I know of his susanoo and katon. However the manga portrayed him as this "One trick pony-guy," who use minimum and full power capability of Uchiha power by different variants of Susanoo depending on the level.
No seriously just look at Madaras Natural u hacked abilities and compare them to its hi. Even when him and Sasuke both have ms Sasuke is a bit stronger than Madara if you're going by frets and abilities. Madara may have tsukuyomi but using that on someone with mangekyou you is pointless. If you compare all three of their MS it's his is the strongest naturally because he has tsukyomi Amaterasu and suzano with the mirror power and the sword of seeking, I think itachi was originally intended to be the strongest natural Uchiha.
I agree with the Itachi part being naturally stronger, but Madara himself didn't develope unlimited tsukyomi until he synced with the gedo.
Talking about Secrets, he's the only Uchiha to ever Unlock a Rinnegan through the whole process on his Own.
He even told Obito he will teach him Uchihas Secret Jutsus, Kinjutsu, Rikudou Jutsu and etc.. and Obito has shown quite few of them.
He just Likes that Style of Fight ( Susanoo, brute force, strenght ), since Amaterasu screws up your Eyes and it's useless most the time ( It didn't do anything in the Manga ) + takes time to Focus everything into 1 Eye and all that..
Wow you haven't been here in a while.
Also the part in bold, apparently it's fan fiction here.
So the whole teaching six path justus, uchiha justus, and shadow and light release will just get you flamed.