Well, I can understand that, since track and road racing is pretty straightforward, but trail riding can give you all sorts of situations.
Can be pretty cool if you have a good course.
It is enjoyable because the trails provide you with a good challenge and great exercise. It's a blast when you get a group of 3 or 4 of your buddies and head out early in the morning after a good rain. Kill about 3 or 4 hours on the trails on a Saturday, then head to the bar for a bite to eat and a well earned beer as a reward.