To add to what MM said, from my own perspective...
There are a lot of benefits to this duo.
Many of cleric's stuns don't damage, and neither does our root. So when I root off of the enchanter, or stun off of them, I don't have to worry that I'll damage the mob and wake them up.
Furthermore, I'd point out that if you're feeling necessarily rushed for levels, you can find an undead area and roll through it like a hot knife through butter with this duo.
The enchanter augments the mana regen of the cleric and the cleric keeps the enchanter alive through pretty much anything. With high charisma, your enchanter is going to be charming everything in sight.
It's a fantastic duo, and easy to get groups. However, I will say this. Whoever is playing the enchanter is going to have to be ready and willing to do the lion's share of the work. It's one of those cases in which hyperactive disorder is a bonus.
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However, that's to say, a good cleric is busy, too. Contrary to popular opinion, a well-played cleric must be hyper alert and ready to use all of her abilities at the drop of a hat.