I found a good website discussing some of the benefits of evidence based medicine. It explains what it is, what a systematic review is, and what this means to you. The information is from The Informed Health Online/Gesundheitsinformation.de Team: IQWiG.
My favorite paragraph is talking about what to do when there is no clear answer for your medical treatment.
It is important to remember, too, that just because there is no clear answer now, it does not mean that there is nothing a patient can do and that someone should take over for them. If there is no conclusive evidence about a treatment, patients need the best description possible of the potential advantages and disadvantages of the alternatives they face so that they can choose what they want to do. A variety of medical and personal issues can influence this decision for the individual.
To read more about evidence based medicine and systematic reviews visit http://informedhealthonline.org/index.433.en.html