New door seals take some time conforming to the door/window. The need for "slamming" the door should change with use.
My driver's side door latched too easily. When closed, I could press on the door and make it shift slightly. I adjusted the door strike (light grey, on the door frame) inward a very small amount (1/64"), and the door is now snug. (This might have eliminated some road noise, if the door was jiggling driving down the road)
Curious: ALL of the door strike bolts (2 on each door) weren't nearly as tight as I've experienced in other cars: VAG, Honda, Ford, Toyota, Cadillac. I snugged each one down about a 1/16" turn.
(I also created a thread about wheel lug nugs: they were <70 lb/ft, should have been 129 lb./ft. This seems rather serious to me, but my SC didn't seem very concerned.)