The argument seems to be that the death was important in the comics because Spiderman was responsible for her death, but in the film she died because his web didn't quite catch her in time and the nerds are pissed because they think he wasn't directly responsible.
But he is directly responsible, or at least that's the way he sees it. If he would have stayed away from her like George Stacy suggested, and not make that I LOVE YOU on the bridge which kept her from leaving for college then and there, she wouldn't have died. If he would have let her go, she would have lived.
It's the same thing, just executed differently. He's still responsible for her death regardless. This is why I said it's fucking retarded. They're only bitching because it's not detail by detail verbatim with how it goes down in the comic, and are completely disregarding the film's context. Yes, Gwen made the choice to come help Peter, but if she hadn't, those two airplanes would have collided resulting in mass fatalities. So her being there was justified, but it doesn't make Peter less responsible for her death. He certainly didn't anticipate that when he drew her away from going to England that the Electro shit would go down and that Harry would show up with a vendetta, but it all happened because he didn't just let her go to England.