As a child I grew up with mutts. My first 'own' dog is a pedigree Golden, choosen by my husband because of it's personality, the incredibly lovely and patient momma dog, and the great breeders we got to know so well.
I don't think it matters. Every dog has it's own personality and either you like it or you don't.
I still have a very weak spot for mutts, especially those considdered 'challanged'.