Beef cooked anything beyond medium loses all of the properties of beef. I've also yet to find a single person that didn't have some kind of psychological aversion to medium to medium rare beef, but when they tasted it it changed their way of thinking. There's always a pattern: "I don't like steak, and it's gross if there's any blood." The reason these people hate steak is it's shoe leather by the time they cook the snot out of it.
People I've converted from "I don't care for beef in general" to "I'll take it medium or mid-rare every time!":
-wife
-daughter
-son
-mother-in-law
-1/2 friends at work
People that still hate steak because they can't bring themselves to try medium:
- father-in-law
- boss
- other 1/2 of friends in office