My copy arrived yesterday, just got thru watching it with my brother. 3D was OK, not as strong as Force Awakens but more noticeable than Last Jedi, which I thought had the most conservative 3D. Depth was noticeable but pop-outs were not as pronounced since the scenes cut so quickly. In terms of brightness, I never had trouble making anything out and the 3D effect was even pronounced in dark areas, so overall not as bad as some of the negative comments I've read in some reviews.
In terms of the movie itself, it's typical JJ Abrams: derivative story, lots of plot holes and sub plots that get left unresolved and paced so fast you don't have a chance to examine it all too quickly while watching it. That said, I was entertained and of all three sequels, this easily felt the most "Star Wars" to me and was the one I enjoyed the most. My personal order of this trilogy would be:
1. Rise of Skywalker
2. Force Awakens
3. Last Jedi