It would be nice to flag if the shell version if different than server (major version) something functionally equivalent to:

> if( dbv.slice(0,3)!=shv.slice(0,3)) print ("mismatched versions");
mismatched versions
> db.version()
2.4.5
> version()
2.5.4

We already print the shell version and that can easily be mistaken by someone for server version.

Just printing server version would help just by itself...

MongoDB shell version: 2.5.4
connecting to: test
MongoDB server version: 2.4.5