I don't know much about RethinkDB yet, but I will say that I have been a big fan (online) of one of its founders, Slava Akhmechet, for years. I've never met him, but he wrote some terrific articles on his website, http://www.defmacro.org/ , a few years ago. Start at the bottom of the list of articles, with "The Nature of Lisp."
Slava is a deep thinker, which makes me very excited to take a look at RethinkDB.
Slava is a deep thinker, which makes me very excited to take a look at RethinkDB.