MongoDB has always been about ease of use. With nothing more than
the mongod binary, starting a MongoDB server is as simple
./mongod --dbpath=/path/to/dataAs a long time user of Oracle and MySQL I'm extremely impressed by just how simple this is. It certainly encourages new users to try it out.
In MongoDB 2.6 and earlier there has only been a single "storage engine" available in the server. That storage engine has very few tunable parameters, so the defaults are fine for most users. If you don't like the defaults you can probably change them with a little review of the documentation.
MongoDB 2.8 adds the …