Wikipedia is generally a reliable source for information, especially recent news and more obscure topics. Granted, some articles are tenuous and need more verification, and Wikipedia has a vandalism and slight problem, but in my experience the Wikipedia interfaces make it easy for anyone to just correct any wrongs as long as the information is correctly referenced. I would give it a B plus because, although it's convenient, it's not always correct, so double check every Wikipedia article if you think something is wrong.