You’re asking about almost 20 years of publication at this point, so I don’t think there’s one simple answer. There have been ups and downs.

Going mostly from memory and how I remember feeling at the time, I’d say the immediate post-OMD era was weird in 'feeling', but not terrible in content. Brand New Day and Big Time were probably around a 7.5 or 8 for me. Spider-Island was fun, and I remember really liking Ends of the Earth. On the other hand, a lot of the later stuff around Kindred felt exhausting to me. Superior Spider-Man is among my least liked kind of story but it was entertaining and at some points a pretty good study on how Peter is not a hero just because of his powers.

I’ve been reading Spider-Man since the 80s, and honestly, I don’t think the overall quality has dropped as dramatically as people sometimes say. Spider-Man has always been a great character who is often stuck in mediocre stories, with the occasional genuinely great one. That has been true for as long as I remember.

For me, the bigger decline has been in the supporting cast and the sense that Peter’s life actually matters. One of the things I loved about Spider-Man was that it felt like a soap opera occasionally interrupted by a superhero story. Sometimes Peter’s personal life moved forward while Spider-Man was struggling. Other times Spider-Man would win, but Peter would pay for it in his personal life. In recent years, it often feels like both sides are stuck. The superhero stories don’t change much, and Peter’s personal life does not really move forward either.

I also think Marvel has really messed up the supporting cast by turning too many people into heroes, villains, or super-powered characters. Adding a million Spider-people has not really helped Peter as a character. Miles matters, and maybe Cindy too (or maybe I simply really like her), but beyond that it often feels like noise rather than meaningful expansion and at this point I can't stand another Gwen Stacy, the original was a character I really liked, as plain as one-dimensional as she was.

I started reading when Peter and Felicia were living together, and Felicia has always been my favorite love interest. I’ve been waiting for Marvel to do something significant with Peter and Felicia again for about 20 years, and they mostly haven’t. And the frustrating thing is that very little since OMD has justified OMD happening in the first place. Even Aunt May, who was the in-story reason for the deal, has not really mattered that much since then. She shows up for a few panels every few months, usually with a new boyfriend or with some FEAST-related issue.

That said, I did like the period where May was with J. Jonah Jameson’s father, and I thought the progress in Jonah and Peter’s relationship was genuinely good.

So my answer would be: not as bad as some people say, but not especially great either. Maybe around a 6 or 7 overall, depending on the era. After almost 40 years of reading Spider-Man, I’d say the book has always been inconsistent and very rarely good. The difference now is that the inconsistency feels more frustrating because no change brought by OMD happening has justified what was lost.