Depends on 3 things 1. The person. Some people look good with mustaches, others don't. 2. The mustache. Let's face it no one looks good in a handle bar mustache. 3. if I am kissing them or not. If I am kissing them it better be trimmed and clean.
I was never really into guys with them. But my fiance' has one and I think he looks great with it, in fact he looks weird to me without it. Lol Sometimes, since no stache is my preference, i forget he even has one. It's really weird. Lol