I absolutely agree with you on this, most people are afraid or ashamed to admit that looks matter to a great extent, and the simple proof is that if you're not a good-looking actor or model you'll not get far in your career infront of the cameras.

Not only in this case, but in may areas of life looks tend to be super important and just like you said people often perceive good-looking people to be more intelligent, healthier, and respectful than average looking people. It's so sad actually, but the real question is what can you do about it.