The reason MongoDB is simultaneously lauded and derided is because there is a bimodal distribution of people using it: those who build databases for a living, and those who query them.

There is something to be said for being able to rapidly prototype ideas, especially if your primary skillset is jockeying JSON in the context of web/app development. However, deciding whether or not NoSQL is the right fit for you or your project/business depends on how much of your time you will be spending getting down and dirty with the database.