A long time ago, in a Mulgore far, far away, I was a young tauren shaman who was attempting to gear up as enhancement after hitting level 70 for the first time. Enhancement shaman who have only started playing within the last two years won't remember the confusing beast that was enhancement gearing of yesteryear, but it was an adventure.
First off, we gemmed strength exclusively. Yes, strength. Despite sharing gear with hunters, we got more (read: any) attack power from strength than we did from agility. More importantly, and this is where Mists of Pandaria changes will come into play, the enhancement shaman of The Burning Crusade didn't try for hit rating on their gear. In fact, we avoided it like a bear tank gemming agility avoids sunders on Warmaster Blackhorn. We did like expertise, which made the few items it existed on like Shard of Contempt best in slot, but it was almost never included on items, and there were no expertise gems. As a result, the majority of enhancement shaman ran with nearly zero hit rating and zero expertise.
If you're reading this today, your jaw might have hit the floor. Never, you'll say, while pulling up your character sheet and crying over the whopping 2,284 secondary stat points we need to put into hit rating and expertise. Yes, you read that correctly. We spend 2,284 stat points simply making sure we can actually hit the boss.