I guess I'd take my 10 over a 5.
As another poster mentioned, you can't look at a 5 which goes beyond being fat (there are fat and pretty 6-9... no such thing as a fat 10). She's on the losing end of the genetic lottery and will most like pass those traits to your children that will have to endure the same hazing and denigration as the mother underwent. My children won't rely solely on their looks but it will be an "access card" that will allow them into places and situations that wouldn't allow them to be such otherwise. They'll still receive the proper education and core values regardless of what the incubator does.
Personality/character is a crock and rarely valued in the dating market. The most sexually attractive, wealthy and powerful in status are chosen first.