Originally posted by AzrongerUh, no, if you highball it, he could potentially be in the same level as Plagueis.
It all depends in your viewpoint:If you take all the hype at face value and highball it, then I'd say he's in the gap between Ventress and Dooku. If you lowball it, he's somewhat below Ventress.
You can also ignore the hype altogether, and focus in his sole on-screen feat. If you highball it, he's unchained Vaylin-level. If you lowball it, he might as well be featless.
If you ignore the feat because it happened during gameplay, he is featless, and the only thing going for him is logical deductions based on his title as the strongest of his time. So he's about your average Dark Lord of the Sith-level.
Highballing it would be claiming that he is better then Exar Kun in lightsaber combat, and superior to Dooku or Maul in TK.
Lowballing it would be saying that none of the hype is true, and therefore, he is in the same tier as people like Sirak.