Fuji, I agree with you that most new Cirrus owners are "unlikely to be entirely stupid", however stupidity and experience are different things.
Seeing through thick creamy marketing hype is priceless.
IO540 has it right.
Draggy gear and fat waistline = slow inefficient aircraft irrespective of the powerplant.
Personally when I am bumping through an active cold front I would far rather be in a handcrafted metal airframe than a rattly plastic jellymould - even if it does have a parachute.
By the way I am 6ft 1" and not terribly slim - even with 3 or 4 aboard the Mooney was always fine.