I've always thought Roxanne was kind of a knock-out, not at all plain, but more of a stealth beauty - she grows on you. The shag hairdo suited her, and I've always loved red hair.
True, PT Roxanne was dull as dishwater in the personality department, but RT (vampire) Roxanne had quite a bit of spark, IMHO.
The Roxanne of 1840 had an interesting and independent personality before she fell afoul of Angelique. And she really looked lovely the way they dressed her and fixed her hair - like a flame-haired porcelain doll.
I've always wished that if they would have found a way to bring Donna Wandrey back as Roxanne or some other character if the show had ever returned to real time.