Do people not get that is was intentionally dumb?
That's kind of the whole point... Do people seriously expect some vapid valley girl cheerleader to be good in a scary movie where she kills monsters? That would just suck. It has dark parts but of course it's mostly funny in a dumb way, because the "dumb" blonde would naturally do or say dumb things along the way. It's not this dark, sarcastic, feminazi crap like the TV show was. (Which I'm sure had many good parts but for the most part is overhyped, and SMG comes off as too intelligent to play someone like Buffy, the way Buffy is SUPPOSED to be. I prefer her as an evil, scheming stepsister or a scream queen).
http://i44.tinypic.com/x4ozk.jpg