Why is it so hard to understand?
1.He is edo, so he knows he can't die therefore there's no need to dodge(when an edo loses a limb you don't see him twisting in pain or agonizing, so it doesn't even hurt unlike a living organism.)
2.If he wasn't toying with the kages and if he wasn't an edo, obviously he would be a lot more careful, meaning he would use Perfect Susanoo,And all other EMS techs right away.(Tsunade was shocked when she saw such monstrous power and asked herself if Hashirama really fought such a beast from hell and won.)
3.Madara is extremely arrogant (given his tremendous power) and tends to look down on every opponent including the 5 kages.(except Hashirama, whom he claims is the only one capable of defeating him).It couldn't be more obvious that he could easily kill all 5 kages if he was fighting seriously from the beginning.
Isn't he the ultimate and main villain in the series? He is supposed to be incredibly overpowered.