Main problem I have with wiki is that on controversial topics there often appears to be "edit wars" going on between two sides that each have a vested interested in you believing one way or another. Sometimes I'll be reading an article and it almost seems to contradict itself from one sentence to the next. Overall though, its a nice site given that all the sources are linked at the bottom. You just have to take what you read on the main article with a grain of salt because you never know who might have edited it to look more favorable to whatever particular group.