Uhh.... Let's think... Tsunade just showed her trump card, and I'm struggling to figure out how you think Orochimaru would kill her with that?
A's Lightning armour's defense and ridiculous speed can't think of a match by Oro
Tsuchikage(Spelling?) Dust release is to much.. He could hurt Madara with that if the Rinnegan didn't absorb ninjutsu.
Mizukage, and Gara I'll admit he could definently hang with them and make it interesting, but 3 out of the 5 Kages would definently win, IMO
Naruto and Sasuke.... Sasuke overwhelmed him, in his mind long before he even got his Mangekyou, I can't see how anyone think's Oro would even get past Amateratsu,
Naruto, took on 7 tailed beasts and dealt with their combined Biju Dama in BM, not to mention the ridiculous speed, enhanced strength, and ability to make more limbs in it... Oro would be crushed,
Bee has his BM which is close to Naruto's Oro is again trumped...
So Like I said he's a genius and he's created things beyond comprehension... The Edo Madara not to mention whatever it was Suigetsu ever found, but that's where his strength lies not in his own fight.
Now about four tails Naruto he was having fun, sure but at the same time barely scraping by he had to use some of his best techniques to survive, and couldn't harm Naruto, and no... It was blind fury, the tailed beasts on their own have shown incredible displays of Raw Power, but they lack the ability to efficiently use them, it's essentially blind fury, Kurama can think but he's never shown any stategic use of power they can't really use jutsu, unless you consider the Biju Dama which in my opinion fits in raw power category so no, Oro is overated..... in the sense that without using his creations to help him he can't his immortality has a large flaw, so overatted, though I do love his goal of mastering every jutsu, and learning the secret of this world.