Generally speaking, using a shutter door instead of a setup gate for an a/d spawnroom is going to make spawncamping worse. It forces blue players to get close to the doorway before they can shoot at red, while red can hang back and wait for the door to open. It also doesn't do a great job of blocking red's sightlines into spawn, since the doors will be opening and closing unpredictably and allow red snipers to pick off blue players who think they are safe. I recommend using setup gates in most situations, and designing the interior layout to block sightlines so that blue players can navigate to any exit without being visible from outside.