The AU Falcon was not a pretty car. When it was released in 1998 the styling (which would subsequently be aped by a much more expensive German sedan) was too much for it's place in the standard family market.
It required a lot of help in the make up department and never really regained favour until the BA. The development dollars never really flowed again and the driving position has been further compromised with every iteration since.
The current Falcon (and impending new FH) are good looking well performing cars with some seriously impressive handling.
They could have been so much better though, if not for this ugly catfish.
Such is life.