Hmmm, on ManNGolf's ratings scale, I'd put myself at a 4, and one Merli's I'd rate myself as a 3...
I think there are plenty of things you can learn on the road that won't apply to a track dash, and vice-versa.
I can think of two drivers in particular, where I'd rather be next to the female who's been driving for around three years, rather than the male who's been driving for over ten (and has owned a torque-steer king MX-6 Turbo and a 180SX)... The female still has a few things to learn, but at least she keeps an eye on the road, and looks ahead and reads the traffic at least a few cars in front of her...