The reviewer notes that significant scenes are very dimly lit, very dark, and these types of scenes do very poorly in 3D:

Star Wars: The Rise of Skywalker isn’t the worst 3D conversion in Star Wars history, but it certainly doesn’t hit the lofty heights of Star Wars: The Force Awakens’ 3D conversion efforts. A decent end to a saga’s third dimensional run, there are stumbling blocks that could have been avoided, but weren’t.

If you’re a 3D fanatic, this presentation isn’t a total waste of time, but it won’t rival some of the best examples of the medium we’ve seen in recent years. However, if you’ve been catching up on all the other films in 2D, you might not want to dive into the world of Star Wars’ 3D universe with this particular film.

Source: To 3D Or Not To 3D: Buy The Right Star Wars: The Rise Of Skywalker Ticket

I am a 3D fan but will probably not see this in 3D. Partially, I need to drive about 20+ miles (30+ km) to the nearest theater where it is showing in 3D versus driving just over 1 mile (1.6 km) to see it in 2D 🙂