I really can't stand facial hair on myself or anybody else. I shave daily because if I start to see facial hair growing I'm like "ARGH GET IT OFF ME GET IT OFF ME!"
Anything beyond slight stubble is, in my opinion, incredibly unattractive and needs to be taken care of immediately. It just looks dirty. I hate beards, moustaches, goatees, the lot. And one of my pet peeves is when teenagers or people in their twenties grow beards just because they can now and want to look older or more mature. That is so obnoxious, and it doesn't work.
As to sideburns, that depends. I don't think long sideburns look good on anybody, but short ones can be OK. I keep my sideburns rather short, and they never really bother me. But I never really notice sideburns on other people unless they're designed to be noticed... which is also something I hate lol.