I never saw barbie as anything more than a plastic toy with hair that's fun to cut and a face that is fun to draw on. I have three girls now and none have cared for barbie all that much once they hit 6 or 7.
I think a worse influence are the ones I see in magazines, tv, billboards, etc.
Personally, I've gotten over a lot of that once I started having children, but every once in a while I start to feel it creep in. I look at my kids (I have more than the average supermodel), my checkbook (can't afford 4 hour work-out sessions daily) and the mirror (I wish i had an airbrush, LOL)