Hey, friend. It's me, 'the Shoes' here. While I'm no super Thunder Shamans, I may be able to shed some light. Defensively, Thunder Shamans are decent. However, are damage is not too dungo. Thunder Shamans benefit too greatly from Haste and Multistrike to ignore it for Versatility. I don't think Thunder Shaman and Charmanader Dark Mages in 2s would be all to viable; maybe in lower MMRs for funsies wunsies. You have to follow your heart.
I am reading / lurking AJ since the very beginning, yet I rarely post or comment anything. But you sir, please post more often, so enjoyable yet informative!
Don't feel very comfy with the "Defensively, Thunder Shamans are decent" but thanks for sheding your light nevertheless.