I would have to say one of the reasons was just its sex appeal. For some reason, women really love Mustangs. I really don't know why, but they do, for the most part. There's something the Mustang has that the Camaro's and Firebird's don't have. I really don't know what it is since in my opinion those look really nice too.
And of course, nothing beats the sound of a Mustang!:r:
And of course, nothing beats the sound of a Mustang!:r: