Ha ha, you're hitting the nail on the head about the fans. But allow me to clarify; there's a major difference between liking her and liking her acting.
The best way to explain this is to flip it to some other character, say... the one that plays the Po family matriarch; one of the old timers from TVB's stable of KLF ("Keh Leh Feh" or supporting cast members). She's obviously nothing to look at (unless you're into "mothers that I wouldn't touch with a ten foot pole" type women. However, she plays her part completely believably. Hence, while I'm certainly not attracted to her, I think her acting is superior and flawless. This seems to hold true for the rest of TVB's KLF stable. Despite their supporting cast status, they are all really exceptional thespians. They convey the emotions required of their roles almost intuitively, and set the stage for the main characters to then move the story along. Just take a look at the one that played the head of the Po family, or the ones that play the good or evil judges, even the ones' that play the servants; they are all believable in their roles.
IMHO, it's certainly OK to like a celebrity because you think they're hot, pretty, sexy, or whatever. However, one should also realize that one's affection for a star doesn't necessarily mean that they're great actors. IMHO, some fans fail to make such a distinction. In other words, some of those Linda fans should try saying "I really like Linda Chung because she's so pretty; it's too bad she's such a poor actress."
Anyways, just my 2 cents worth.