Originally Posted by Purist
The other element I neglected to mention in my first post is that a circuit should have a good "flow" to it. That is to say, the track should look and feel like it all fits together as a cohesive whole. Doing this allows competitors to get into a rhythm, and means that the timing for braking, accelerating, and turning is much more apt to be at the right points to allow for actual racing to take place.
If, as a competitor, you cannot get into a clean rhythm around the course, you end up being partially, or perpetually, on the back foot so to speak. You're trying to catch back up with the circuit, or are just trying to react to the odd turns it's throwing at you. When this is happening, you're not able to concentrate on going after the opponent who is ahead or you, or keep a weather eye to hold back the adversary coming up from behind.
I have to say the track is the same for everyone, everyone has to solve the odd turns their little own ways, that's the nature of competition. Having said that I agree the track is better when it flows, but some oddness needs to be introduced to break up the boredom.