Part of building a track is to "teach" the comp trucks to follow the course in a speedy manner by laying down a somewhat buggy system of directional/speed lines which can be a difficult task and one the majority of past track makers avoided altogether hence the bot trucks you see that run into walls or drive off cliffs.
Even the best laid bot courses are no match for the average racer once you've become familiar with a particular course so I don't know of any list of good bot bad bot tracks.
I spent time on each of my tracks trying to get the comp trucks to at least appear sober, but, you can only get them so good no matter how much time you spend on them. I even went so far as to teach the bots to cheat on one of my tracks (orient express (i think)) by taking a short cut that humans cannot, but even then it's not much of a challenge after a while.
Some of the best tracks ever made for the game are by Winterkill aka Wint, they not only look great the bots do well.
http://mtm2.com/~tracks/tracks.cgi?search=wint