Hm, maybe the Flinch part is what i don't really like about this Guy. But even without it, he will be a whale character, so it doesn't matter i guess.

About the Guy vs Naruto question: um... Truth Seeking *.... And ofc we can consider the fact that Naruto won't let himself be damaged, like Madara did. (and Guy had help against Madara, so yeah...)

Um... So i just checked the manga (you know, the absolute canon material) aaaand yeah. Madara or Naruto, doesn't matter. With orbs, it's a win. Guy was saved against Madara by: Rock Lee, Minato, and Kakashi-Gaara duo. And yes, his final attack was a beast, but then again: Madara didn't even tried to dodge it or anything.

So yes, for me, this is the end of the debate about this fight.