To answer your question, yes, I have dated some "Plain Janes" and fell for a couple of them.
The eyes are a strange invention: At first the eyes do not pick up the hidden treasure inside the vessel, but given time, some "Plain Janes" begin to look so appealing and beautiful, a man can get lost in love and never find his way back.
Conversely, I have also dated outwardly beautiful women with incredible physiques. In fact, I married one. But, I have found that many beautiful women have narcissistic tendencies and tend to be high-maintenance. Anyone who is stuck on themselves loses me as a potential suitor.
So, yes, I would drop a vitriolic she-devil in a heartbeat, and I do not care what her physical state-of-affairs was. Indeed. If a woman has the personality of a southern pacific rattlesnake, she would take on that appearnce to me.
This is to say that I typically see things for what they really are, so a "Plain Jane" with a beautiful personality and other pleasing traits, could end up looking like my dream girl, whereas a physically stunning woman could end up looking somewhat unappealing should she harbor a malicious spirit.
As they say, "Beauty is in the eye of the beholder".