I think there is some truth to "looks don't matter" especially when it comes to long term relationships.
I was in church today and saw a guy who is 5'7", balding, glasses, overweight and goofy looking in the face with his wife who can probably pass for a "7" when she is all dolled up.
I am 6 feet, full head of hair, fit and here I am rubbing sticks together.
Remember, women have different needs than men and don't think like men do (we are stimulated by physical attractiveness first and foremost)
Being 6'3" and looking like Ben Affleck WILL NOT help you if you are socially awkward, shy and lack confidence.
Women respond more to social status, good conversation, confidence and how you make her feel.
What is the lesson here? By all means, look the best you can but don't put too much focus on it.