Well my 2 cents to the discussion. We really tried to make Mongo work over the last 1.5 years. We decided to go for mongo mostly because of JSON and geospatial

Well my 2 cents to the discussion. We really tried to make Mongo work over the last 1.5 years. We decided to go for mongo mostly because of JSON and geospatial indexing. We became to realize that for our business case it is not the right tool. That said, and I work with databases now for 20+ years, I don't see what problem Mongo solves.