It's more than an "opinion": it's a value judgment.
"Mess" is a hard word to quantify; "ugly" is a harshly subjective descriptor; "overweight" is overweight: many overweight people- MOST overweight people- are not slovenly.
I am not defending Linda Tripp's character or actions. But I expect that a good bit of why she was so reviled was because of her decidedly non-conforming physical attributes and fashion choices. "Non-conforming" in comparison to the women we are accustomed to seeing on television.
I have no doubt she considered herself unattractive. I imagine that lacerating self-image was informed by years of feeling that people considered her slovenly.