This is a valid point. I dismissed NoSQL for years, and still (largely) do (I prefer to have a schema, documented data structures, deal with relational data etc.)... but I finally gave Mongo a go the other day, and am actually quite impressed. For a simple endpoint I can throw arbitrary persistent data in (rather than the filesystem), it's let me get a couple of proof-of-concept projects out the door much quicker.

Note that I'm not intending to comment on its scalability or how appropriate it is for other projects, just that I agree with you: dismissing it out of hand is hubris.