Wikipedia is overall great, though highly politicized in some topics, for science/engineering topics there's actual review by other Wikipedians and sourcing is solid.
Moreover, the talk page always has anything that might be controversial about the article that you might be interested in.
Sure, it will rarely display incorrect data, but it happens less and less as antivandalism bots become smarter.
It seems to me like a lot of the articles are accurate, and some of the check marked or featured articles are downright great.