Okay...time to go into things.
What I dislike:
Spoiler:
Mei is once again shafted so that someone else can look good, though in this case it was Tsunade so that is better than Onoki at least. The reveal of the Edo Tensei thing was good but also leads to the question of why Tobirama(who HAD to have known the seals) didn't free himself the moment he was summoned by Orochimaru. My guess is that since Orochimaru was there and the Kage were not in top form, they didn't have enough free will or ability to set themselves free. Speculation but whatever.
What I liked:
Spoiler:
Madara gets to stick around for a bit longer at least and got to do so not because of a magic Rinnegan power but because of his past knowledge(he may have remembered the seals because of his Sharingan though). Dan and Tsunade actually have a sweet moment and we got to see his technique in action. And most importantly, Chiyo cameo. And she makes a joke while dying. Awesome. I hope I'm that cool when I'm old.