Despite the fact that Yahoo! Answers has been more successful than Google's similar venture, this article refers to it as "every middle-school teacher's worst nightmare about the Web." Apparently the factual errors are egregious...

Quoted: The blockbuster success of Yahoo! Answers is surprising once you spend a few days using the site. While Answers is a valuable window into how people look for information online, it looks like a complete disaster as a traditional reference tool.