Agreed. This was a... I'm not sure if this is quite what I mean, but nothing else is coming to mind, so... a mature story? One that showed how May had grown from a naive young woman to the character as we know her. I really appreciated that, not to mention the look at what Uncle Ben used to be like! (I know some writers - notably Jenkins, who I think wrote at least two stories about Ben and Little Peter - have written about Ben, but for someone who was such a big influence on Peter you'd think we would know more about him.)
And I liked that May still had some feelings for Johnny. I think that's realistic. I loved that she was able to forgive him, too. Despite the "great power equals great we all know what" thing, I think Aunt May has had just as much - if not more of - an effect on Peter's morality.