I am so glad to see Senjutsu Eddie in his full glory in this dungeon. It really sucks then that this is the most inconsistent dungeon we have seen in a while with clears.

First off, the first wave of insanity has a gunner Shinobi with Wrathful and Archer talismans. These talismans are not usually equitable on her, so it's already crap on the first wave.
The third wave features max Awakened Samurai Ed who can just end your run randomly because of his fury. Could we stop having instant kills in dungeons?
Finally, the fifth wave is so completely inconsistent and dumb that I have to think it is bugged. Sometimes, the enemy team refuses to take damage. It's not made clear as to why this is. Second, Senjutsu Eddie's fury makes him unkillable unless RNG is in your favor. My runs have taken anywhere between 1 to 4 minutes because of Senjutsu Eddie refusing to die. That isn't fun, guys.

The other difficulty levels aren't as bad, mind you, but still. Insanity should be tough, but not horseshit. Even with the best characters, the entire thing is still dreadfully hard. I'm not fully certain what teams the devs used to clear the dungeon, but there are so many things to counter that I can't imagine what it would be.