When Resident Evil first emerged on the Playstation back in 1996, I was at a friends house and he decided to rent it from his local blockbuster, to see if it was any good. By god we were amazed by the graphic FMV's, as well as the gameplay itself.
To sum up the DS version, if you had the privelage of playing this when it first arrived on the PS, you will rekindle your first memories of what made the game such a wow factor. If you are new to the game series, you will appreciate the fact that you get a lot of game on such a small cartridge.
Anyone who owns a DS should have this in their collection.