Is any part of this game good?
The game is decent (I mean, internally coherent, combat kinda-sorta works, writing is adequate) up until Chapter 3 I say. I have not played this after release and I do not intend to replay it even under torture, but as a 40k RPG up until Chapter 3 (that's still 20-30 hours if you play leisurely) it's a .... adequate game, bordering on mediocre. The combat system is somewhat functional and they probably have improved it since launch.
The writing is essentially mediocre, if you played previous Pathfinder games you know that Owlcat is the master of writing a lot and saying very little. It feels very perfunctory. Art is likewise mediocre, the only good things are the chapter illustrations honestly, good Blanche feeling.
Music is beyond forgettable, a sin in a 40k game.
My suggestion? Wait for the second DLC, pirate it, and then finish Chapter 2. Everything after needs massive changes to be
acceptable.