I remember back in Burning Crusade, where Xav, when he was with DnT, tanked Razuvious in the BT / Hyjal tanking gear when we ran our Naxx pugs back on Korgath. Was curious, with the current tanking gear out now, would it be possible to tank him without mind controlling the adds?
Our priests have a crazy tough time with this fight and it not being fresh in their minds anymore has amplified that.
That being said.
We started the fight with the priests attempting to tank it, but they missed a few taunts here and there and lost control some as well.
So our tank taunted the boss through great avoidance and so on he survived for most of the encounter, he doesn't always hit hard enough to one shot a tank, but he is still capable of one shotting 25 man tier 9 geared tanks still.
Our second tank picked it up and we finished him off.
So it's possible to tank and spank him, but RNG could take you down.
I would suggest using an avoidance set for Razuvius tanking.
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Agg's tanking guide