The positions of the slider really doesn't make much of a difference. Just because it's less than half doesn't mean it's a bad TV. The article How to use your televisions video controls over at techlore.com can help you understand and use the various video controls on your TV without any need for special patterns.
There are also DVD's designed to assist you in getting the most out of the user controls. DVD Essentials is one of the best. NG is right, position indicator is rough at best.