Pfft, if you want more Vader, just go watch the OT continuously. Or make a picture flip-book out of Vader promo-shots.
As DarkYoda said, this was about who was BEHIND the mask, not the mask itself. It was not to show more Vader.
Hell, I was satisfied just hearing the angry groans that Vader emitted when he stumbled off the table, that kind of "Grah!" he tends to make when he is kicked or falls back or is hit by his son during the duels.