I never got the fascination for the original version. What's so great about it over the Director's Cut?
1. Those of us who played the original tend to notice things missing in the DC. There are missing animations, missing music tracks and sound effects and some toned-down violence, as well. One example: stepping into that club in Syria and not hearing any music at all felt just wrong to me.
2. Nico's sub-plot seems promising enough at first, but it ends a little too abruptly, for my taste. And since it doesn't really add that much to the plot....let's just say I liked the concept of expanding her character, but I didn't like the execution that much.
3. David Gibbons' artwork doesn't fit. Now, don't get me wrong. I love his style. It's just that in this case it seems out of place compared to the art direction in the rest of the game. Besides, why do all characters except for George and Nico look like caricatures, and why are they constantly staring like they've seen a ghost?
Now, all of that doesn't make the DC a bad game. Far from it. Those are simply things that bother me about the DC. And so I'm happy and thankful that GOG gives us the original version.
OK, I didn't know what was different. To me, though, the Nico additions were good, and the gameplay was much more convenient. I haven't played the original, so there's no nostalgia from me.