Liked the first episode quite a lot (8/10), thought the second was oke (6/10), found the first confrontation between Obi-Wan and Vader to be simultaneously cool, and underwhelming (7/10). However, this fourth episode is just plain bad:

Episode doesn’t move the story along one bit, instead giving us the second Leia rescue in four episodes. The infiltration of an Imperial base or something similar has been done too many times already.
There’s hardly any character development.
The base nobody would be stupid enough to attempt to invade doesn’t have a simple thing as radar to detect incoming ships in Vader’s personal corner of the galaxy of all places.
Imperial traitor lady (I forgot her name, but like the actress and the character, despite the plot armor she has in this episode) is acting very suspiciously in plain sight, and the only guy noticing it gets killed in the same room a few feet away from other officers with nobody noticing.
Reva, remains extremely one note and uninteresting as a character, despite the show’s weird fetish with her. The fifth brother is even worse.
Reva kills the guy from The Path in the previous episode, but thinks a little kid, who was thrust into this situation by Reva herself, can provide brilliant insight into the workings of The Path and the Jedi.
Leia apparently was already on the radar of the Empire at 10 years old as a Jedi sympathiser, and should have been identified as being strong with the Force after resisting Reva’s mind probe (whos job it is to kill Jedi and kids with Force potential), but still manages to become a Senator and a covert leader of the Rebellion.
Reva calls old Ben Obi-Wan to Leia’s face, so there can be no doubt she has a strong personal relationship with Obi-Wan Kenobi, despite ANH clearly suggesting she only knows General Kenobi as a former associate of her adopted father.
Imperial traitor lady conveniently escapes from Reva by literally slapping a Stormtrooper unconscious, a new low for Stormtrooper competence.
The good guys escape while the base is on high alert with Leia hidden under a coat walking past hundreds of troops and officers without getting noticed. Are you kidding me?
One of the most important imperial bases can be almost destroyed by cracking one window with a single blaster shot.
I hoped Vader let Obi-Wan escape on purpose in the last episode, but I guess not, since he was clearly very pissed when Reva let Obi-Wan get away in this episode. This ruins the ending of the last episode, because vader could have easily grabbed Obi-Wan with the Force, or put out the fire as he did moments before. So, now Vader is incompetent as well.

Overall a very disappointing episode (4/10).