I have an opposite experience. I'm a scientist and my research topic is accurately depicted in Wikipedia I would say better than any textbook. Of course Wikipedia has to be reductionist, it is not required to provide a full literature review for any topic. If you are doing a PhD-level research, then Wikipedia will fall short of providing the latest and finest details. Other than that, it's more than enough. I also believe it is the duty of experts to contribute to improving Wikipedia (I know many who do).