Sometimes it just gets out of hand -- how exactly are Hunters wearing Tier 1 supposed to use their peripheral vision? But just as Bob says, oversized and garish shoulders are a big part of what makes WoW Warcraft. If we walked around with realistic shoulder armor, the game would look that much more boring.
So here's to the praises of huge, awesome-looking shoulders. We're looking forward to a lot of stuff in Wrath of the Lich King -- the new class, the dungeons, and the new continent to wander around on. But I'm also looking forward to seeing just how the armor designers will top having blindfolded statues of women on shoulder pieces. It'll be amazing for sure.