Here's where I'm coming from:
http://www.enworld.org/showthread.php?t=228449
A definition of a role-playing game:
1. Narrative Principle: A role-playing game takes the form of a narration, with play consisting of a series of logically connected events.
2. Action Resolution: Critical game decisions are made collaboratively by using a set of rules.
3. Immersive Persona: At least one player takes on the role of a specific character, making decisions "as if" that character.
4. Freedom Principle: Any possible action that could be taken by a character can be adjudicated within the immersive framework of the game.
CRPGs fail on multiple counts.
1. Rarely is a CRPG narrative, although it can be. KOTOR is. City of Heroes it not... the Clockwork King is constantly being defeated, and Atlas Park never gets any better.
2. Actions are resolved mechanistically using a set of rules, and player input. There is no collaboration, there is not even feedback... an unanticipated action might even crash the game.
3. This one passes.
4. This one it fails. Only actions programmed into the game can be attempted.