I realize it is popular these days to hate on Mongo, but the FUD is getting a bit old.
Almost every single IT company exaggerates claims, says their product is "the best" and "amazing" and suitable for every use case under the sun. Oracle did it. Microsoft did it. Mongo did it. And thousands of companies in the future will do it in the future. It's called Marketing.
And I think you should speak to all these customers (http://www.mongodb.com/who-uses-mongodb) and tell them they don't serve any real world need. I would imagine a few would ask the same question of you.
The day we start jailing people for their marketing hype is... well, it wouldn't be a good day.