Its not an impression its what causes the rasp, a well design exhaust can flow lots of gas and not rasp. a badly designed exhaust...rasps....fact
Why?
A 458 rasps. As does an LFA, 599 GTO.... the list goes on and on. i very much doubt they are considered as poorly designed. rasp with a crap exhast note will never sound good, but with a nice exhaust note, it can sound savage... which can sound there are nice exhasts that dont rasp, such as a masser GT. it's not for everyone.
I hate blue cheese and for ME, the mould ruins it. but try telling your average Frenchman that a bit of mould is a sign of a bad cheese.