I think we should be careful not to condemn all of Wikipedia on the basis of entries in an area which, by its very nature, is contentious.

I have a friend who is a statistics lecturer at a well respected English University and he says that the Wikipedia entry on basic statistics is excellent - better than the majority of text books.

He has a shrewd idea who the author of the entry is and says that he (the author) is a well respected academic who will make sure what he puts in is both correct and up to date.

That said, I agree that we should use a certain amount of caution when using Wikipedia. Nevertheless it is a very useful as a starting point and they do make the effort to reference their articles so you can follow up their sources.