Mediocre. I've never liked Chopper and never had much reason to be interested in AP-5. And now that I know AP-5 is supposed to be an Alan Rickman impression, I'm distracted by what a bad Alan Rickman impression it is (bad enough that I never realized that was what it was supposed to be).
Also, wouldn't it have been enough for Hera's power surge to wipe the ship's memory banks without having the ship blow up and kill all those people? That seemed gratuitous. I mean, how much agency do those Lobot-types even have? They seem less like villains deserving punishment and more like enslaved victims. Killing them all seems like an ugly thing to do.
Could Hamill even pull off a voice performance of Luke as a mid teen?
I very much doubt it. He can't even recapture his Joker voice very well anymore -- he's reprising the Joker in
Justice League Action, but his voice sounds much rougher and more strained. No way could he pull off sounding like a 17-year-old.
I looked to see who else has done Luke's voice in recent years, and Eric Bauza has played him in
LEGO Star Wars cartoons, while Christopher Corey Smith played him in the
Phineas and Ferb SW special. For what it's worth, Bob Bergen plays him in
Robot Chicken.
Finally, I find it odd we won't see Vader at all the rest of this season, because he is the Key to Destroying The Sith - which is what Ezra was looking for. Ezra (and Kanan?) must learn that non-interference with Luke (and Leia?) is the only way to succeed.
But Luke is the catalyst to set Vader back on the path to fulfilling his destiny. Maybe Ezra's role is to protect Luke from some danger (perhaps Maul), so that he'll still be around in 2 years when R2 and 3PO show up.