An experienced male knows the best females in terms of overall well rounded quality is the average plain Jane's which sit at 7 in the looks factor
Anything higher you get into the conceited bimbo, narcissistic migraine territory and anything lower you get into the stupid insecurity, low self-esteem, crab bucket territory.
Looks are a major factor there is no denying this, it's a biological predisposition in males, but what sets them apart is experience.
the dude that has never experienced the 9's and 10's before is far more hung up about looks then those who did.