Exactly. Whilst I've no doubt that the GT-R is a great bit of kit, remove a couple of hundred kg from it and it'd be even better,
Thinking about Mizuno-san's statement:
Best for speed: Determined by power and drag coefficient. GTR has plenty of one, but is lacking on the other.
Best for acceleration: Power to weight combined with driven wheels. GTR is poor on PtW (relatively speaking), but has immense traction from the 4WD.
Best for performance: Heh, define 'performance'! Yeah, I'll give him this one alright, no doubt the GTR has stonking performance figures.
What we really want is a sub-1000kg car with 500bhp and 4WD that looks like a Very Smooth Thing.