I think they do have their own enthusiasts over here. For me, and probably the rest of the paying public the major killer is that its LHD only. That turns me off instantly (same with a CGT and the enzo should I ever win the lottery - wrong hand drive!). There are enough problems on our roads without having to think about that!
After that I think Corvette really needs to step up the build quality in terms of materials used from what I have seen. There are things I like about them - mental bhp and head up displays!
If I was living in America it they'd certainly get looked at!