Well, I would rather be with an interesting, intelligent person who's ugly than a beautiful person who's completely empty headed. But that's typically not the case.
I'm Asian, and (I'm going to generalize here, sorry) most Asian girls are decently smart. So in most cases, although there are dumb ones out there, I can have a good time, good conversations, and find interest in most of the girls I know. So, beauty is a greater factor for me, because very few people are polar to where they are very good looking + super stupid, or vice versa.