Nostalgia definitely plays a part. It was only the second time I remember a comprehensive world with a consistent "internal logic". I.e. it's own laws of morality, physics, causality etc. You felt like you were walking around on the continent of Britannia, exploring and discovering, seizing ships for transport over water etc. I tried one of the later ones (either V or VI, don't remember which one) and didn't like it. The isometric, colourful jumbo sized graphics took up too much screen real estate at the cost of the sense of "exploring".