How reliable of a source is WebMD?

Based on research I just recently performed, I have come to the conclusion that WebMD.com is a very reliable source. A few of the company's direct staff members are medical/healthcare providers/professionals, having licenses in the field of medicine. All of their colleagues at their sister company, MedicineNet.com are all medical/healthcare providers/professionals.

To answer bluntly, yes. WebMD is a reliable source.