What other open source product can offer following?
- document oriented - makes easier to abstract it as a relation when needed(yes, I know no joins... buy a helmet)
- dynamic fields - a more agile pace of development (good bye database migrations, patches)
- indexed arrays - "tags" and "attributes" functionality
- geospacing
- store binary files (GridFS) - replicate, backup easier binary files
- aggregation framework - analytics
- simple and eazy replication - easier to scale ???
- ttl - handy for caching
Just saying...