You can avoid the dreaded "group projects" that frequently leave one or two students doing all the work, or spoiling it for everyone else.
Or am I the only one that hated those? It's not like you could pick who to work with either, because the teacher knew that no one would pick the slackers. So if you were a particularly good student, the teacher would stick you with a slacker on purpose, hoping that you'd somehow motivate him when she had failed to. How ridiculous.