What are your thoughts and opinions about Wikipedia?

I look there first to get a broad overview and then, if interested or I feel like I need further information will look elsewhere as well. Generally, I think that it is reliable. My son, however, rolls his eyes if you even mention that you got info from that site. He feels that since the entries can be (and are) re-written by the public-at-large it is of dubious quality. How do you feel about the site and the information provided?