What s/he said, and what everyone seems to be saying.Milney said:-scissor attack!-
Wikipedia is okay for just finding out about stuff generally but some of the more specific/specialist articles can have mistakes in them. These articles are probably not going to be under as much scrutiny as more popular pages and so mistakes go unchecked.
As was said, the subject's specialists who could spot the error are not likely to go onto the page to see the error because they know the subject. Also, people who might spot the error could think that they are one's mistaken and thus it is again, not corrected.
The references are useful for finding hard to find research articles though ^_^ In that capacity it's more like an ideas exchange then an information hub....