We stopped using it because indexing was annoying, and we found a product (CosmosDB) that automatically indexes everything for us and still has a pretty decent

We stopped using it because indexing was annoying, and we found a product (CosmosDB) that automatically indexes everything for us and still has a pretty decent SQL-like query syntax. I also think the "cool" factor has stopped. It was very chic to use Mongo back in 2010 when everybody else was trying to scale with SQL. Nowadays, DynamoDB/CosmosDB/Cassandra eats Mongo for lunch.