The '07-'09 gen GT500 definitely has it's flaws, but IMO it's the better looking of the newer models.
It's very heavy, for one, and it handles like it. The suspension is a nightmare, stock. Of course, the 2011 is a vast improvement over my body style in handling, horsepower, etc. However, I absolutely LOVE it. I love the torque and the modification capabilities of the car - the block is more than capable of handling 700 conservatively.
Honestly my expectations of what an interior should be aren't that high. I have all the essentials - power windows, seats, cruise control, etc., and in navigation I think is great, too.
So overall, I think they did a great job on the GT500's. Is it a Cadillac? No. Was it meant to be one?... No.