I agree there has been a lot of 'negative' reviews and anecdotes. Mongo has its own market and its own purpose. The idiots who don't take the time to understand it fully, or even 50% of the way, will certainly run into caveats. This happens in EVERY DEV ENVIRONMENT. Not just Mongo...

Think XCode... Postgres... Cassandra... REDIS... jQuery... .NET anyone?

Negativity levels are a reflection on one's own preparations (or lack thereof).