The ability to publish an event, invite people, get feedback from them and then have it all stored so I can go back at a later date and look at it again. It's not perfect but I have found ways to work around some of its issues. If you want something that does everything, do your research. We are solving our time management problems by publishing training events and allowing people to ask questions of us live. We also use it as a way to manage our internal communications and keep everyone up to speed with what we're doing.