I would say I use it situationally and I treat sap the same way it's not your first choice of CC.
Serious CC is the domain mages, hunters and locks because they can apply there CC repeatably and reliably and they can still dps while they have the target under CC.
MC being channelled you CC a target but party loses your dps so its only half as effective as other CC forms unless the MC'ed thing can do alot more damage than you could have.
The four pit event before the eye boss in Heroic BF is a classic place I love to use MC. You can MC any of non red ones in the 4x4 packs and it has the advantage over sheeping that the other 3 dont go after the mage. The packs are all melee so there is nothing to break an MC it makes a relatively hard 4 elite fight easy mode.
Your main CC when you are a 70 will be shackle in Kara not MC
The reasons you take a spriest on a run is it brings good DPS, Fort Buff and mana and health regen from Vamp Touch. They are often referred to as battery's for that reason.
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