There are situations where MongoDB and the like are specifically more appropriate than traditional databases, and I do not include not understanding SQL syntax. In such situations where a ratio of needed scale to the resources available is particularly high, MySQL and other traditional databases are not a real option anyway.

However, there are of course also situations where, if you try to use MongoDB as a drop in replacement for a traditional database and then are surprised about data loss in exotic situations, for example, then you weren't really doing your job in the first place if the different goals never came up in your research of solutions.