The one issue with the Stargate role was being 100% night kill immune. I'm cool with giving the SK/third faction a fairly equal chance of winning, but that was dumb. Everything else was fine with it.
Eh, so long as he scans guilty, I'm not sure if being 100% night kill immune is necessarily terrible for an SK. After all, an SK needs to have some chance, no matter how improbable, of winning.
I've played in one Mafia game where the SK actually deliberately aimed for a Modkill because he hated being an SK that much, simply because the SK had absolutely no chance of winning. We didn't like that player, and him killing himself was ****ing stupid, but it was symbolic of how hopeless being an SK was.
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The Legend of Snake: http://tinyurl.com/3cal86z
The LoS Instruction Manual: http://tinyurl.com/3jlax8h