Person A: "What is speleology"
Person B: "The study of caves. Here's a wikipedia link if you want to learn more."
Person C: "Wikipedia isn't a reliable source@!@!!!!"
Me: I wish people would stop mistaking "don't use this as an academic source for citations in a paper" with "this is not a reliable source for getting an overview of what something is." For non-controversial topics, Wikipedia is rarely inaccurate, and controversial topics are typically flagged.