The Blade Runner Director's Cut really... wasn't. The film was butchered to begin with in the original release because the artless souls at the Evil Corporation were worried much more about money than art, so the film was altered from the artist's vision in order to make it more commercially viable... lotta good it did, right?
The BRDC was much better, but it still doesn't fufill the potential. Ridley Scott didn't actually oversee its creation; he was actually in Europe when BRDC was compiled, and he simply communicated the changes he desired to an assistant. Hopefully someday there will be a real directors cut and a decent DVD release.