Except when it doesn't. We've had data corruption issues related to oplog, out of sync secondaries and excessive resource usage on the primary. As far as major

Except when it doesn't. We've had data corruption issues related to oplog, out of sync secondaries and excessive resource usage on the primary. As far as major problems. There were also a bunch of smaller problems but in fairness those were on the nodejs/mongoose side of things. Would not recommend.