I'll tell you the same thing they tell every person who asks about the series in /co/
"The story is bad and the characterization is flat, the only good thing are the character designs and the nostalgia"
I love Ghoul school threads in /co/, pretty much the only reason i visit

I like to look at Ghoul School as a possible origin for modern "monster girl infatuation." Without it, things like Monster High and Monster Musume probably wouldn't be as popular.