I think Wikipedia is fantastic. Yes, anyone can come in and edit articles so there may be some discrepancies, but there are some quality standards as @Sarcasm pointed out. I have yet to find an article that was blatantly off-base.
What makes Wikipedia good is it’s simplicity. When an individual wants to find some basic info, they have quick and easy access to to an enormous amount of information. Should you cite it a college level research paper? No. But is it an easy way to check up on something you are curious about? Yes. I can’t even count the number of times I’ve been reading an article or book and thought “Hmm, what do they mean by this?” I can take a couple minutes, go to Wiki, and gain a little perspective. I think that is the essence of Wiki, quick access to more knowledge, which is something that I would never consider as a recipe for disaster.