This isn't really being fair to MySQL. It was pretty terrible when it started out (corrupted data, no joins, no transactions, silly locking, didn't support half

This isn't really being fair to MySQL. It was pretty terrible when it started out (corrupted data, no joins, no transactions, silly locking, didn't support half of SQL, etc.), but we must not forget just how terrible Mongo was and still is. It shipped with unacknowledged writes as the default for a long time.