Two years? From what I've read, and the timeline of swtor, the sith inquisitor enters the sith academy in 3643 BBY, and in 3641 BBY he/she ascends to the dark council.
To go from a lowly slave to the dark council in two years is more than a "quick" rise, as it is often described in-game. The speed at which the inquisitor goes through the ranks should be awe-inspiring, and fear inducing, also considering how young the inquisitor actually is. Darth Marr refers to you as a child. At first I thought he was just trying to talk down to you, but he's right; the inquisitor is incredibly young for their title.
It stands to wonder why there weren't more Sith Lords, or Dark Council members, who feared you like Thanaton did.