... demonstrates that wikipedia is pretty good at self-correcting itself !
It may be good at self-correcting, but most people don't re-visit the site to check if a particular fact is still true - or have the desire to check recent edits or follow editorial discussions on the article. If you cannot guarantee the validity of the material at any instant you visit the site, then it is essentialy worthless. That said, nothing can be 100% right, but you need to have confidence that what you are reading is, in all probability, correct. Otherwise you may as well save time and google the answer elsewhere.
IF I HAD A MINE SHAFT, I don't think I would just abandon it. There's got to be a better way. -- Jack Handley, The New Mexican, 1988.