I think it's getting to a tipping point where more developers have been burnt by the overly generous promises of MongoDB then those still believing the marketing. I think there would be a lot less hate for MongoDB if it hadn't advertised itself as being more mature than it was. If they'd positioned themselves as a solution for specific use cases and clearly differentiated it's suitability compared to relational databases.

That said, I also think a lot of the blame is due to developers with limited database experience, who believed they could do a 1:1 drop-in replacement of Mysql/Postgresql with MongoDB. Of course that's not possible, but then MongoDB didn't seem to do much to argue against the idea.

Bottom-line, MongoDB isn't optimal for the average CRUD application, and I think there's a growing number of developers who have been burnt trying to use it that way.