i say 90% of D&D is the interaction of words with friends... the laughter and being able to have real conversations... video games have NPC with pre-determined conversations, and you must select what you say. Here you can just say what ever you want, how ever you want. When you go to attack, its all based on dice, your chance to hit which can be put on computer. The main thing that makes D&D pen&paper so much better than video games is its not limited to the programming... its what you make it. I mean, one campaign i was DMing my friends and they were going around buying hookers, and starting fights in bars... nothing to do with the campaign but it just made us laugh.... you cant do that in a video game unless the game already programmed it in there.