I'm level 38 and have a pretty decent time. My current lineup is Barriss, Chewie, Consular, Dooku and Asajj Ventriss. The latter I went with after toying with Talia and some others because even though her buff cleanse doesn't work correctly all the time, she's very useful for removing aggro-magnet buffs.
She's also easy to level up, it would seem, because she's in the arena shipments. That said, I wouldn't mind getting Sidious either to shore up my darkside team.. but I am not sure he'd make my PvP team. AoE doesn't seem that great to me right now... but I have little experience with him.
What do you think?
Ventriss is 4-star so it would be 13 shipments to get her to 5, 16 shipments to unlock Sidious.
Quit 7/14/16. Best of luck to all of you.