Last I heard of MongoDB it was getting utterly buried by the Jepsen guy, and for anyone that follows distributed systems at some technical level, that is damning. He finds stuff wrong with everything, but that one was particularly damning.

MongoDB has always seemed to place write consistency secondary to other priorities (mostly sales / read / features) which is frankly a crap way to do a database, much less a distributed one. And I am so sick of MongoDB basically saying "no it's fixed in the new version" which is always a major red flag.

Right now it's getting its lunch eaten by Postgres's document interface from what I can tell.