In chronological order.
He used Izanagi days after dying.
He knew the seals to release edo tensei somehow. Even while his soul was out of his body.
He survived getting sealed multiple times by using susano'o (b.s.)
He absorbed amaterasu with no eyes.
He used susano'o with no eyes.
He survived an encounter with 8 Gates God Guy
He survived getting bisected.
He survived getting impaled by black zetsu, absorbing a shit ton of senjutsu, expanding and exploding and lived until the sage left.
1) Wrong. He used Izanagi before he died, he set a time lag on it to make it take effect days later. It's exactly the same thing Itachi did with the amateresu that he placed on Sasuke and the Koto Amatsu kami he placed inside Naruto. Why is it plot when Madara sets a condition and time lag to his sharingan jutsu but not plot when Itachi does it?
2) It's not somehow he knew the seals, Madara knew how to perform Edo Tensei just like Orochimaru and Kabuto did, except they learned it from a scroll and he copied it with his sharingan. If you know a jutsu for close to one hundred years then obviously you will know how to counter it by then. His soul was still in the impure world by the way so get your facts straight. Dan did the same thing, he used a jutsu while Edo was being released and even replenished Tsunade's chakra in his soul state. Once again, why is it only plot no jutsu when Madara does it but not when another character does?
3) You're grasping at straws on the surviving getting sealed thing.
4) I don't think it's plot that he absorbed amateresu more than it's Kishi not explaining things. At the time Madara had Hashi's sage mode so it could be that he was using Hashi powers to absorb it, seeing as Hashi himself has shown both chakra absorbing and chakra supression jutsus with his mokuton. If he used preta path (which was never stated by the way), then yes, using preta path without eyes would be asspull/plot no jutsu.
5)Susano'o without eyes is definitely bs no jutsu, agreed.
6) Surviving eight gates Gai? I think I disagree here. I think it's the opposite actually, suicide jutsu or not, eight gates Gai being that strong is pure bs, asspull, plot, and crap no jutsu put together. And even then, you must remember that not only did Gai get help (Minato, Kakashi, Lee, and Gaara collaborating to get rid of Madara's Gudou dama), but Madara was also held back by plot. For example, why didn't he use PS as a buffer to Gai's attacks? What happened to his Gunbai that reflects all attacks, even TBB? Why did it mysterious disappear? Why did he not use Limbo to stomp Gai? He used it against the tailed beasts, and used it right after defeating Gai on Naruto, but for some reason he couldn't use it against Gai? Just who was saved by plot here actually?
7) Survived bisecting? Did you forget that Tsunade survived the same ordeal? So you think a normal human can do it and it aint plot but not Madara, a Juubi Jinchuuriki with Hashirama sage mode and dna? Yeah right buddy
8) Yeah I'm not quite sure how that expanding and exploding thing is supposed to work, so I won't respond to that one.
9)I apoligise for the wall of text, I do space my texting on the phone but it always appears as a wall of text when I post. I dunno why, maybe my phone is not that smart.