8. 1999 Audi TT
The Audi TT was a big advancement over the previous Audi sports coupes on the market. But when you thought about what the design brought to the table, it was nothing immensely noticeable for the brand. The turbocharged motor was one of the advantages, and the Quattro drivetrain made the TT a stellar bargain in terms of design and sheer horsepower.
But the design was unimaginative and the car lacked any sort of creativity. The TT stayed in production for over a decade and was perhaps one of the biggest disappointments to come out of the decade. Audi has long been a proponent of innovative technology and driving characteristics, and the TT fell short.