When is MongoDB the Right Tool for the Job?

This puts me in a quandary, because my recent stint on the job market has shown that just about everybody is using MongoDB, and I’ve just never been in any situation that I have needed to use it. I also can’t foresee any situation where there is a solid technical reason for choosing MongoDB over it’s competitors either, and the last thing I want to do is lead people astray or foist my preconceptions onto them.http://lh5.ggpht.com/-ZONCzADE1JE/U0OeTOPN6DI/AAAAAAAADCo/3yDdBC2RIRA/2438326-laughing-hysterically.gif