I will go further on to say. The biggest problem is the perception that a particular tool will make up for bad practices, general indiscipline and many other sm

I will go further on to say. The biggest problem is the perception that a particular tool will make up for bad practices, general indiscipline and many other small time problems. If you start with such an assumption only bad can to the project. MongoDB has its uses, but if you are making an assumption that its going to make up for SQL related use cases then you shouldn't be surprised if the consequences are going to be disastrous later on.