I have been dabbling in pally tanking for a bit now after playing a protection warrior as raid tank for ages. Playing a protection paladin feels like cheating when you come from a warrior. You toss your avengers shield, duck behind a corner to break line of sight, hit consecration and the whole group of mobs is beating on the paladin.

Once they start beating on the paladin, it is rather hard to take aggro away from him. The paladin will have two passive, always-on features running that by themselves are good enough to keep mobs against healing aggro. Toss in a consecration and holy shield now and then and you have considerable damage, threat on every mob and basically no attention required. The last bit is the absolute plus of the pally tank. You can look somewhere else while you press two buttons every now and then. You could make a castsequence with a 10 second reset and include the key binding in your spam button. Its ridiculously easy and low maintainance.

As for healing, the paladin will need a bit of burst healing with group pulls. But, there is an easy work around for that. Wait until the paladins HP have been dropped below half or so, which by the time expired gives the paladin solid amounts of threat on each mob. Then use AoE fear, nail down a mob or two, use the next AoE fear until the incomming damage is lower than the group healing.