Those who know, they don't need to be told. Those who don't, they will probably fight / downvote you because they think that if something has so much positive, then how it could contain any negative? That's ok, our brains are hardwired to simplify things. There have been numerous studies, and numerous discussions e.g. on Slashdot, on this topic, and the truth about the bad about Wikipedia is truly horrific. But I'm an optimist, I believe they/we will deal with that at some point.