EVERY popular anime has lots of fat fangirl fans.
Anyway, Slayers never aired on US TV and never achieved mainstream recognition in this country. It was never close to Naruto-popular. In Japan it was the most successful anime in the country for a couple of years, but it didn't stay popular as long as Naruto has.
Anyway, it's hard to say how good the new season is yet, but I enjoyed the first episode.