As a resource for finding out about obscure stuff it is invaluable. I agree that what is written is not necessarily the truth but that is true of all information. A lot of mischief is perpetrated on wikipedia but generally it is only popular/controversial/political stuff that gets attacked. For our little folkie pond, i think that the correct information far outweighs the incorrect - plus you can make corrections and add stuff, which is more than you can do for other internet and written sources!