Threads like this one make me so very, very tired.
The OP names a celebrity, expresses mystification with that celebrity’s success, and then goes on to claim the celebrity is not intelligent or attractive or a good actor or a good singer or otherwise does not possess the traits that are the supposed foundation of the celebrity’s fame.
The subtext of these OPs is always: “My taste is better than everyone else’s, and I don’t like this person. Therefore, everyone else has bad taste.”
DMark, Leonardo DiCaprio is famous because not everyone is you, all right? Is that a simple enough answer for you?
I think Fiver’s point is that some people seem to have the attitude that they are the sole arbiter of taste for the universe. I had a friend like this; all his opinions about books, movies, music etc were expressed as “X is good/bad” rather than “I don’t like X.” There was no room for discussion once he had decided how he felt about anything. It drove me nuts until I just decided it wasn’t worth the aggravation of trying to get him to acknowledge that anybody else’s opinions might actually have merit. I just nodded and changed the subject.