Want to know what it is about RPG games in general that makes them addictive. It's both a topic of conversation and a question that will lead me to putting more ideas in my own game. As for if they are or not, to each is own in opinion. I personally enjoy casual aspects of an RPG over an MMO's grind.
Though I do agree immersion is a great factor in a great game. Feeling like you have a part in what's going on, to be specific. Some are immersed by the audio or such other things, but for me, I'm immersed when I feel like my own decisions, good or bad, have changed the world in some way as I play. I also agree that minigames to keep one entertained also very much help them stay interested.