MongoDB has been pretty decent (the defaults early on were probably not the best choices)...
The biggest difference in RethinkDB's approach has been data sanity first, niceties a close second (nice devops and dev interfaces)... It's a very well thought out database, and as long as people are moving a little farther away from SQL thinking and interfaces it makes more sense.
I'm not sure where automatic failover stands wrt RethinkDB, but barring that, I would probably reach for RethinkDB, MongoDB or ElasticSearch for most small-medium db tasks, depending on what the application's needs are. By medium I mean less than 10-15 server cluster. Anything bigger, Cassandra would probably be my first choice.
The biggest difference in RethinkDB's approach has been data sanity first, niceties a close second (nice devops and dev interfaces)... It's a very well thought out database, and as long as people are moving a little farther away from SQL thinking and interfaces it makes more sense.
I'm not sure where automatic failover stands wrt RethinkDB, but barring that, I would probably reach for RethinkDB, MongoDB or ElasticSearch for most small-medium db tasks, depending on what the application's needs are. By medium I mean less than 10-15 server cluster. Anything bigger, Cassandra would probably be my first choice.