Heh. You and I are on the same page here, WhipiT. I've been told since level 40 that I would drop Dooku because he doesn't matter at the high end, but whenever I play without him, I miss him horribly. So I have ignored this advice and continued farming him, and almost have him to 5*. I have even started recharging his nodes.
Your drop rate estimates may be a bit generous though. I am not sure 1/3 is the right rate.
Of course nobody knows what the meta will be, but so far, I still find a spot for him.
BTW his stun is only 40% on non-Jedi, and there's tenacity as well, so his stun is not terribly reliable. Against Jedi, though, he's a one-man wrecking ball, and Luminara and JC are still everywhere. That's one of the reasons I am loathe to remove him - he can single-handedly take a threat like Lumi or Old Ben out of the game. If I am fighting a team with Old Ben, he gets every Dooku attack and usually never gets his special off at all. That's incredibly useful.
Even without Jedi, going first is very handy, especially in GW where you can have him "go first" multiple times in a fight.
