The criticism tends to be more on the story - not production value. It was expensive, and that shows (in some regards). The main criticisms are that the story is overproduced, overly complicated, doesn't fit into Epcot (new or old), a huge IP shoehorn (further pushing the park into a thematic mess) and that the attempt to make it fit is actually quite the failure (since the parts of Epcot they are harkening to are the very parts they are removing). Same with the ride experience. Save for the motion sickness, which is a separate issue, the criticisms tend to be about placement and how it cost what it did - not that it isn't a fun, entertaining experience in a vacuum.
Think if they built Star Tours in the middle of Fantasyland, using the story that Princess Leia had a huge respect and love of Disney Princesses and wanted to showcase Princess culture from her galaxy.
The post show hallway gets actual presentation criticism, which I would say is valid.
