I've played a bit and I really enjoy it. I've been focused on the Villain side and it seems Villian Aggro is really strong. I think you're right about the power curve and Legendaries not being any more powerful than the Rares. Maybe there's an argument for Han just because he slots really well into a super aggro deck that seems really strong, but even then the best cards in decks are either Sith Holocron or Holdout Blaster and Jetpack IMO.
I built a Phasma, Raider, Nightsister deck that is a really slow controlly deck with lots of cards that give you tons of actions to take (Hunker Down, Backup Muscle, Underworld Connections, Tie Fighter, etc) so your opponent fizzles in a round and you have 5+ more actions to take after they claim the battlefield that was pretty fun to play, but I'm not sure if it's that great.
So far my favorite deck to play is an Elite Bala-Tik, Jango, Storm Trooper build with tons of gun weapons and it just blows through people like crazy. I think it's better than the Han-Rey decks. I don't know if there's enough support yet for a control deck to be able to handle it on either side of the card pool right now. Killing someone round 2 is very consistent with this build and if you can force a Bala-Tik trigger you just start steamrolling through people. Love it. All I need is a 2nd Holdout Blaster and I'll be set. The deck has zero legendaries as well, which is awesome. I don't have a 2nd Jango so I can't test playing Elite Jango, Elite Veers to see if it's better or worse with this build. I think it's probably really close.
Can't wait for tournaments to start up and we get a look at a real meta.