Shaman/monk isn't necessarily what levels the fastest, but it's among the fastest, and it's probably the most flexible and dependable duo. You don't have to be outdoors, you don't have to rely on kiting, and you aren't restricted to some risky mechanic like charm. Two necros might kill mobs faster, and cleric/enchanter might have the potential to take on harder named spawns, but neither of these will have the ability to go just about anywhere and level or farm items while having answers to almost every possible scenario. Shaman/monk just has the optimal combination of damage output, tanking and survivability, sustainability, and risk/downtime minimalization. They're not necessarily the best at each of them, but unlike any other combination, they have enough of each to make almost anything possible.
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