Google: MoreSQL is Real by Williams Edwards.
One comment on the post summarized it:
Super rant that really crystallized my discomfort with the whole NoSQL business .. At the end of the day, it’s a ‘war’ between various APIs to access B/B+ trees !
Well, but it is an enjoyable rant, so read it and see for yourself.
I do think one of the advantages of all the hype has been an increase in at least considering different options and data structures. Some of them will be less useful than the ones that are common now, but it only take one substantial improvement to make it all worthwhile.