I generally agree Mongo has some rough edges, especially when you use it more, but I don't think it's hard to understand it's popularity. Mongo is simple to get

I generally agree Mongo has some rough edges, especially when you use it more, but I don't think it's hard to understand it's popularity. Mongo is simple to get started with, the interface is similar to JS (which is what a lot of devs using Mongo are going to be connecting from) rather than learning SQL, there are no migrations necessary to add a column, etc.