Yeah, in general people like to look at and play as attractive characters rather than unattractive ones. So I guess you could say that they make the game better, at least better than the alternative. It doesn't always have to be the case, but mostly yes.
There's this new narrative that says people want to see themselves in characters with all their flaws and ailments, but I don't think human nature works that way for the most part when it comes to entertainment. Most of us want to something to admire or to aspire to, it's about escapism after all.