I would have to agree. Stackoverflow is in the alexa top 100, with over 400 million page views per month, and it runs off a single MS SQL Server instance (with

I would have to agree. Stackoverflow is in the alexa top 100, with over 400 million page views per month, and it runs off a single MS SQL Server instance (with a hot replica), with a Redis cache in front of it. All the high-scale users of nosql systems end up having to learn a lot of arcane technical wizardry to make it scale (as demonstrated by the slidedeck linked here), and I'm not convinced it's actually easier to scale something like mongo than a traditional RDBMS.