I know how reviled Sins Past and One More Day are. Having never read them, I got them out of the way recently. Both are bad for what Sins Past does to Gwen Stacy, Mary Jane keeping that a secret. One More Day a deal is made with the devil to conceal Spidey's secret identity, end the marriage of Peter/Mary Jane Watson to bring Aunt May back alive. I'd say One More Day was the worst of the two.
Having read both, it's soured my opinion on JMS Spider-Man work, a shame as his characterization work with Peter/MJ/Mary Jane was the book's biggest strength. Nobody wrote Aunt May as well as JMS. Does Sins Past and One More Day blot JMS record on the book?