Idk what to say for this thread. The zone was nerfed apparently to discourage the constant farming/grinding that was taking place by higher tiered toons. Now the new Cita is BQ elites (or kaesora, depending on your group make-up).
It's extremely hard to judge a zone's worth, or "the best zone" in terms of exp/pp per hour, I don't see how feasible it would be to even attempt it. But in the instance of Citadel, there was no doubt about it: Best PP, Best exp: because it was the hardest, most challenging zone on the server. It was a beautiful thing (and this is after it had been nerfed previously).
But the main point here is this: Experiencing is one of the keystone features of our game, and players from each of the top guilds on the server have agreed there is a major flaw with the "best" exp zone in the game, simple as.