The results are so vastly apart than I don't think there's enough salt that you can add to make MongoDB look good here. They also were quite generous by compar

The results are so vastly apart than I don't think there's enough salt that you can add to make MongoDB look good here. They also were quite generous by comparing load using non-durable write for CouchDB, HBase and MongoDB against Cassandra's durable write. From my personal experience many scaling problems that you have with MongoDB once you switch even to a relational database that can't scale out are laughable.