Road courses look good, but don't play as well as ovals. Nothing good can come of this. The car feels glued to the road and oversteer is non-existent. This is nice in theory but fails in practice. The one thing every driver wants is consistency.
Consistency allows a driver to make decisions based on past experience and future expectations.
A slight bump may cause a car to wiggle, while another small bump may send the car flying. Another time this same bump did only minor damage. This exposes the heart of the driving engine - a game based not on physics, but rules. In the real world, a stronger bump creates a stronger result. The same thing happens when you glance against the wall.