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I suspect that most "noSQL" advocates have a poor understanding of the difference between relational/structured data and unstructured/sparse data. Virtually all of the "noSQL" software is incapable of managing complex relational data, as far as I can tell. Why no one points this out is baffling to me.

"noSQL" is useful for for application layer - where caching and short-term storage are important; but most "noSQL" advocates I've seen seem to think that it should replace an RDBMS, when that couldn't be further from the truth. "noSQL" is useless as a structured backing store where RDBMS are used today, especially for large systems.