Not asspulls since they can be explained, Ashura most likely had two children and his body traits divided between them, Kishi is known to divide power between children.
One child would have inherited the Gedo traits and life force, the other would have inherited the Juubi's KKG and large chakra reserves, both would have potential to learn high level Senjutsu. Hashirama and Naruto combined form both halves of Ashura's body.
Hashi and Madara's power levels weren't asspulls, they were both equal. You should know by now that using a bijuu as a weapon is no different to using a sword in a fight.
Madara used his dojutsu to its full extent just as Hashi used his Sage Mode at full power, in the end they both fought until they were on the verge of death in base mode. And they both survived the fight, they were equal.
You claim Naruto is an average shinobi but blatantly ignore he can use Kage rank jutsu ever since he was a child. He doesn't need any other technique because Rasengan and RS have negged every opponent he's ever faced.
And his ability as a Jinchuuriki comes from having Kushina's blood and Uzumaki genes which descend from Ashura, so your claim Minato is the only reason is strong is BS.