Actually, this is probably preferred. Seal of Command is a fantastic low level tanking seal, you will out threat, and even out dps most of your group. Just wear a shield and focus on your dps until you have enough points to go far down into the prot tree. I've been leveling a Shaman healer, and as long as the dude out front has a shield or is a bear, I've had no trouble at all keeping them up. Actually, even the fury warriors, rogues, and other melee are easy to heal if they take aggro, their only real problem is they can't keep mobs on them consistently