They're to blame because they're telling stories that I would consider to be total crap even if Peter was still married.
And really, that's what it comes down to - more than the explicit retcons, it's the implicit regression of Peter, from the smart, skilled, not-perfect but still-impressive peer of Captain America and Iron Man, that he was during JMS's run, to this shambling mess of self-parodying cliches from the character's Silver Age, except that even the Peter Parker of those days had a bit more on the ball than this dunce.
I could relate to the Peter who was teaching high school, married to a struggling Broadway actress and finally receiving the respect that he deserved from other heroes, but given the way he's been behaving lately, that character might as well have never existed, because this new Peter has no brains, no balls and not that much heart.