Madara gets wrecked if he doesn't have Kurama.
He has the same avatar as BM Naruto, therefore he has BM Naruto's durability feats like blocking the juubi's laser with its tails. The juubi's laser is at least a tier above normal bijuudamas and PS slashes, so minato can take madara's hits. However the opposite isn't true as minato can produce
You must be registered for see links
and he can even warp them into the construct once he has PS tagged.
So minato can block multiple of madara's most powerful attacks while madara can't block minato's most powerful attack, and minato has an easier time hitting madara than madara does him due to the mobility of his construct, his ability to FTG bijuudamas into his seals and his ability to teleport himself.
With kurama, he gets the power output to exceed minato's own, and has enough nukage to level the entire battlefield removing all of the ftg tags, has the speed to hit minato and has durability that far exceeds minato (100% Kurama's tails coated in PS).