What I liked most about Moodle was that I could create nice online quizzes. It takes very little time to do. You don't have to even read the paper, it automatically evaluates the quizzes. It gives the student grades and provides a lot of useful statistics. For example, it indicates which question was the hardest, easiest, and where students made the most mistakes. Everything is available to you. You couldn't do this in regular paper test hard copies. This was my first use case.