No class will pull their weight in a chanter duo except druid and cleric. Others can function, but their contribution won't be worth the 50% exp they take, especially not if you then have to adopt a poor strategy for them to have anything to do at all. Forget about trying to tank stuff without a healer, forget about fear-kiting just because it's the only way the other half of the duo has a purpose. Bring a class that compliments the enchanter or you might as well play a different duo altogether.
Shaman has too much overlap and waste. You won't need any of the stat buffs, you won't need the haste or slow, you can't help the enchanter very much and there's just no real synergy. You can heal and I guess help a little with damage, that's pretty much it. It'll function, but both classes would be better off alone.
Clerics have CH which helps a lot with keeping a charmed mob alive, they tend to have thousands of hp and that's difficult to keep topped off with any other healer. Their huge hp buffs are also great for the enchanter who's gonna take a beating now and then. Stuns are great for handling charm breaks. Druids can ensnare the charmed mob which helps so much with keeping it under control, their heals are sufficient, SoW/evac/port is super convenient, and tracking is nice for dungeon farming. If healing isn't needed, a druid can do okay DPS with permacrack.
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