When you think of this, one word comes to mind: "confusing".  I mean it is like, put one leg over this one and pull his head towards your leg and he will go to his back. 

If you know how to leg ride and learn some moves on the bottom, you would be unbeatable on the mat. 

I know some leg riders and they are pretty good.  One was even a state champion (Tim McDaniel).

All leg riders have to know what they are doing or they will be put right to their back.  It is probably the most confusing thing to do in wrestling.  Not only is it confusing, but you also have to constantly work on it.

If you leg ride, know some moves on the bottom, and get takedowns you will be a great wrestler.