I think you mean "Will my decision to advocate something be based on the appearance (but not content) of a fansite"? That answer is no.
If you are offered a company car, and your choices are between a Ferrari and a Lada, would you pick the Lada because on your way to the office, you saw a dirty, dented, pale-pink Ferrari?
Now, I may recommend people not going to Perlmonks if it started using red coloured Comic Sans fonts on a bright green background, with all the headers blinking, but even then I'm not recommending against Perl.
Perlmonks != Perl.