How I Use It
For units in Gov/Econ or Big History, I would create 10-15 key terms that would be on the next quiz or test and allow the students time in class to study them on quizlet. Some kids enjoyed the competitive aspect of trying to get the high score on the various games, but most didn't care about that. It's more appealing for kids to study vocab online in a game-based format than in their textbook or with notecards.
Quizlet is a great way to review for quizzes and tests. My students who took advantage of it improved their performance on quizzes and tests. As other reviewers have noted, however, it doesn't allow for deeper critical thinking questions; it is basically a vocabulary matching platform. I like how if you are in hurry, you can find user-created definitions that can be accurate.