"Ugly"
I would think appearance is the last consideration anyone would have in choosing a self-defense handgun. The only thing I can think of in the looks department is not to have the stocks, etc., embellished with skulls, grim reapers, or "Kill 'em All ..." type mottos. And that's only because such decorations are totally unnecessary and how they may look if shown to the jury in a civil case.

"Expendable"
Any gun is more expendable than I am. No one would say "Gee, I have a $1,000 handgun that is rock solid reliable that I am very proficient with, but I carry a $200 junker that I hope might work ok if I'm in a tough spot."

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