only thing is that he can't keep fighting normally.. or at least hasn't shown to.
Izumo and Kotetsu stabbed him and he did pretty fine.
Stabbed himself on the heard and nearly bisected with the scythe. He did alright.
Not too different from Susanoo swords. They cut deep.
You're comparing physical strength which Tsunade has (to break off sword like that).
Also, yes I will say it: anime filler doesn't count
OT: Hidan is immortal, not invincible. Considering where he is as of now... Should be obvious.
But you're underestimating him. You realize he was capable of constantly pressing the attack on Kakashi. Tha speaks volumes for tai/Kenjutsu. Hidan could evenly face off with Kakashi's natural talent and Sharingan.
If you want to claim he can't hit Sakura I'm going to go ahead and say the same: how can Sakura hit Hidan when he's displayed a greater level of Kenjutsu (hand to hand style) than Sakura ever has?! Also, only a punch that destroyed the head would be enough to stop Hidan... He's not bright, but he won't let that happen.
Sure a lot of people beat Hidan... But Hidan can easily beat a lot of people as well. Not to mention he can beat people above him if he gets some blood. All he has to do is bail out and run away. Or draw in cover. Hell some people just watched him do it (lol Asuma).
Don't see the point of your Hidan hate thread. He's clearly not invincible.