The interior of the C6 isn't the best, but IMO it's as nice or nicer than a base 986 interior in terms of fit, finish and quality of materials. As far as stying goes, I think the C6 is positively beautiful. I don't like the fit of the headlights the best, but the rest of the look is clean and purposeful.
Of course it's not going to look as exotic as a Ford GT or a Ferrari. Would you pay $60k-$120k to upgrade your Corvette interior to that of a GT or an F430 if you still had a Corvette afterwards? $60k is about the price differential between a C6 and a GT. The Corvette is built to a price, and the money goes into the stuff that matters - the chassis and drivetrain.