Do attractive people get better treatment?

I’ve noticed, under various circumstances, that it seems people who are perceived at ‘attractive’ are given more slack, seen as more intelligent, and just generally overall receive better treatment than those who are deemed as plain, unattractive, or not pretty. Are we all so shallow as to judge others (and we all judge others, despite our denials saying otherwise) based on something as simple as a pretty face? I’d like to hear your thoughts pro or con.