Guess my tastes must be the opposite of the masses. I thoroughly enjoy the Cape Ring tracks (though the jump is ridiculous), the Indy and Daytona Road Courses (but dislike the ovals on their own), London, Top Gear and so on.
The Nurb is hit and miss with me; I like driving it on my own and combined with a good time and weather setting, it is beautiful, but online races are generally frustrating for me due to the lack of passing space, added to the fact most people like to nudge some of your car on to the green stuff.
Everyone seems to be thinking of the tarmac tracks only. For me:
1. Some of the Charmonix tracks are just too full of tight hairpins one after the other for me to enjoy
2. The Toscana dirt track seems dull to me
3. Any very high speed track that is raced with unevenly powered cars.