What is "a lot" of people? I've seen both characters put down, but usually if both are discussed, it's Miles who gets bashed in favor of Peter. That's anecdotal, of course.
Miles has great potential, still, but he has suffered as a headlining character. His first book was awesome, if not a bit too decompressed. Then stupid events that he should never have been a part of. Then he did some pseudo-team stuff, which was fun. Then events again. Then 616. Bendis hasn't written a lot for Miles that has been memorable, outside of his initial run. But Miles is a good character, and he can be
the Spider-Man of this generation (literally, since I think that Ms. Marvel is already this generation's Spider-Man, figuratively speaking), in the right hands. Miles has great capacity for growth as a character and a fantastic supporting cast (Marvel even ganked one of them for Homecoming). We just need to see him really blossom.
Peter, on the other hand, has had his potential squandered. He was growing as a character. Then it was all undone. Fans can demand change, sure, but sadly, the more recent changes came at the cost of his character.
I mean, this character, whose theme is one of
responsibility, makes a deal with the actual devil in order to escape responsibility for his aunt being shot. In the process, he manages to escape responsibility for his wife as well. What a hero! Now he can date again! Yay? Like, is OMD what they really thought people wanted to read? Do they think the ends justify the means? Because that's villain talk, and we (should) know now that it didn't. Virtually none of the stories since then required Peter to be unmarried, or benefitted from it. Essentially, we got Peter as a man-child who can potentially sleep around so that real-life man-children can fantasize about him doing so. Period. And it wasn't worth it.
Peter Parker has long been the "everyman" hero. He used to be the everyman who could look forward to the next steps in his life. Now he's the everyman who is stuck, a single late-twenty-something trying to live the life of a single early-twenty-something. It's pathetic.
PS
I've dropped Amazing, so maybe this was explained. Last I knew, Peter "Stark" Parker was a personality shell built on Ock's memories of Peter's erased memories. Like, a copy of a copy. You know, this guy:
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That would at least excuse some of this, but not the decade prior to Superior.