The number one thing people want from Dragon NaturallySpeaking is good performance. This means very accurate dictation at high speed.
If you have the right hardware, prepare NatSpeak properly, and speak clearly, then you should be able to dictate at over 120 words per minute at between 95% and 98% (or better) accuracy. Really. If you are not seeing results like this then something is wrong.
Here is a set of topics which cover a number of tips that should help yo get the best performance.