I never had the impression during all the gameplay of being really in a D&D game. I just felt like I was in a D: OS game
Being in a DOS game gave me, and I am sure many many others, of being in a D&D game (even with it not being based on the D&D rules). So, taking what was already a strong D&D type game and adding actual D&D rules certainly gave me a strong impression of really being in a D&D game.
