Tech Central Station has an article by Robert McHenry criticising Wikipedia for inaccuracy. Yes, this Tech Central Station. McHenry found an error in the Wikipedia article on Alexander Hamilton. Of course, within hours of his pointing out the error, it was fixed. Unlike the numerous and far more serious errors you see in Tech Central Station.
Incidently Tech Central Station is drafted by a lobbying company that works for Microsoft. And Microsoft Encarta is a competitor to Wikipedia. And McHenry was Editor in Chief of the Encyclopedia Britannica, another competitor to Wikipedia.