My 2000 is as quiet as any car that I've owned. When I was test driving some other Bonnevilles, I did notice that some did have more noise than others. To me, it souned as if it was coming from the rear of the vehicle, like the trunk area. As I didn't purchse any of those, I didn't investigate further. I did mention it to a the salesmen, who of course were absolutely shocked!
Could you guys maybe check the top of your driver'* side door and see how it seals against the body? My Aurora, and my mom'* 2000 SSEi both have this same problem and both have pretty bad wind noise. The top of the door does not line up correctly. It is pulled away from the body quite a bit..
The doors on my '02 seal tight...no big gap like your pic....your door may need to be "tweaked" by a body repair person.....I once had a door that the guy just yanked on it in a side/upwards motion and the door sealed just fine after that....I wouldnt recommend doing this yourself as it is really easy to make the situation worse......
I have a slight gap in the rubber weatherstripping that runs along the top between the front and back doors. However, what is there seals up tightly against the car...and the doors line up with each other.