I love Wikipedia. In fact, as a child, I had a set of the Children’s Encyclopedia Brittanica, all 20 volumes, and I would spend hours, randomly flipping through articles. Now, we have a resource which is massively bigger, more detailed, and kept up to date. It is criticised because people can edit it. However, edits and new articles are subject to review, and on a pretty democratic basis. Experts in the field of say, Agaricus mushrooms, will keep an eye on that area to make sure articles are fair and well researched.
I think it would be a sad day if Wikipedia were to go, or if it was populated by ads. Its income is entirely based on donations. I have decided to donate to it, and I urge any of you who value knowledge to donate to it too. More on Wikipedia here