I think the GTR is more comparable to the new Corvette Z06. I read somewhere that it beat the Z06 (only) on a road course, but I'm not sure by how much. I do agree, however, that car (no matter how great it performs when it works) is garbage for the $. The dealers will not warranty the work that needs to be done on them and the transmissions are garbage.
The 1/4 mile time for that car, stock, is horribly weak... and that's with the AWD launch.

I'd take that car in my almost 6 year old Z06... i'd even remove some mods.
*putting on flame suit*
Skyrhine leghumpers unite!