Definitely not Revan. Maybe Sidious or Luke Skywalker.
If he lived to his full potential, then Anakin.
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Starkiller? It was pretty badass when he pulled down that Destroyer.
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He didn't. He guided it down. He wasn't nearly as powerful as the above mentioned Sith,
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What about Darth Nihilus?
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Well yeah, maybe him. But I'm not too sure if he counts, because I don't believe he had too much control over his ability.
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True, his hunger controlled him. However he was super powerful.
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True.