Yeah I'll concede that the Vulture was a bit much, he was probably one of my least favorite parts of Spider0Man lately, but let's be honest here is it really THAT violent? The whole rating system seems arbitrary and barely noticable anyway, the only major things you could tell is the regular stuff is tame and the MAX stuff isn't
But my major point is that OMD didn't usher in violent content in Spiderman, it's always been there, I mean, Green Goblin was impaled to death!
It just seems that whenever something is bad in a Spiderman book is always gets tossed onto the "OMD" problem pile.