It was very good, but the movie competed with its own backstory. We got to see how the movie was developed along with behind the scene activity. I didn't find the backstory as interesting as the movie portion itself. To show how the movie was constructed, there were many breaks.
The breaks broke the continuity of the movie portion. And the backstory immediately dissolved the fantasy of what it is to be inside the world of Wes Anderson. We were continually reminded the characters were simply actors in a movie. Sadly, I lost connection with the movie characters.
I believe splicing together the movie portions would have drawn me into the story empathizing with the characters and lending a believability of the rich and detailed scenes. And this would rate 4+ stars.
Another thought: The movie Barbie is coming soon, so I was watching for Margot Robbie. I kept thinking she was hidden in the background characters. She wasn't in many scenes, but today I realized she was the Mcguffin.
Final thought for improving the movie portion: One of the main characters should have been replaced by an understudy for a scene or two. Could have been an amazing puzzler till they broke for background bit.