Not trying to troll; Really interested.
I have never read a story (other than Spider-verse) with him in it.
(So I missed out on his introduction and initial hype)/
But what with all the chatter about him being a good candidate for being the new MCU Spidey, and the idea that Secret Wars' main gain is to get him into the Marvel Universe, the character must have a huge appeal.
I'd like to know why... Is it his personality? Back story? Fresh perspective?
His character is really well written. Plus the Ultimate Spider-man universe is so great, everything has been created by one author, so it all makes sense. There's the legacy there of the old Peter Parkers life, as well as Miles' own supporting characters.
I personally don't want to see him move to the 616 universe, I think part of what makes the character so great is the Ultimate universe that he is in.