There is a really interesting post about how writing that code is literally stealing from your clients. I tend to agree. http://ayende.com/blog/3712/stealing-from-your-client
This is not true.
At some point, you will need to extract a subset of the relational data and represent it using your application's in-memory model. If your hand is not forced by the ORM, this is unlikely to be a direct mapping of the database.
This is no different than a network protocol, wherein the protocol is not a direct representation of application state, and the application does not attempt to model the network protocol using the same constructs that it uses to model its in-memory state.
...and that is where you have just created an ORM. You don't need a library to be using an ORM. Change 'extract' to 'map' and the meaning is the same.