I think that manufacturers have done a great deal of work to get aftermarket coolers that performs better than the stock blower. I'm not sure how real heatsink should be but they've done quite well as they have to meet the two slot width constraint that caters to a broad range of users.
The Deepcool Dracula would be better but not many would want a single card that takes up five slots
, preventing the possibility of a multi GPU setup. Even Asus slimmed down their current DirectCU II from three slots to two slots.