I was 'too fast' on the uptake for document based data stores.
I even remember when it was called NOSQL. No structured query language? Really?
After it came out I jumped in with both feet, and started using in production. Immediatly wishing that I hadn't. Mongo had some major problems, however MongoDB is getting better and better, and only now (version 3+) would I recommend that others use it in production.