To the OP's question, this is not a very efficient duo unless you are basing it on starting a group.
Cons:
Exp wont be great since DPS will be rather poor.
Crowd control will be an issue.
You will have no means to snare.
You will have no means for rapid transportation of any sort.
The tank's aggro is questionable; no snap aggro and no buffs to help gain aggro.
You will have no means to track.
You will have no means to debuff tough mobs.
Pros:
You will have stun.
You will have complete heals.
You dont have any hybrid penalties.
For a small group with a healer its pretty tough to come up with logical reasons to not choose a shaman, especially at level 24 and up. Regens, slows and cannibalize allow them to easily keep a tank alive while maintaining mana. Haste and the best melee buffs available will increase dps massively which affects exp and the toughness of mobs that can be encountered. Torpor aint half bad either
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