I think it is exceptionally rude - some people uploading photos 15 minutes after the ceremony! I don't have a problem if its of them and their friends at a wedding, but I do when they upload photos exclusively of the bride and groom! They have hired a photographer for goodness sake - I'm pretty sure those are the photos of them specifically that they are king to share, not the dodgy over the shoulder shot taken by an attention seeker that shows the bride with a double chin and the groom half blinking.
People should use some common sense. As someone who doesn't like posting photos of myself or loved ones on the Internet or Facebook, why does me getting married entitle others to upload photos of *me* on *their* Facebook account??