Just my opinion but it really sucks when the main villain of the story gets easily defeated by one of their own comrades. In the latest manga chapters of Naruto, Black Zetsu reveals that his loyalty was never to Madara but to Kaguya instead. Kaguya was using Madara all along to reclaim her incarnation and powers so she can continue on her path of obtaining all of the worlds chakara.
Madara was definitely a bad ass and has gave every hero and villain in Naruto alot of hell, talk about beast mode! But unfortunately all his efforts just gets thrown by the waist side. The series isn’t over and you never know, he just may return… or not.