This userscript applies to IMDb user reviews pages. It displays the ratings with 10 stars, instead of just 1.
It also works when you click the 'Load More' button to view more reviews.
Screenshot from e.g. https://www.imdb.com/title/tt0076759/reviews
With the script:
Note: if you use this style: IMDb.com - Nightmode (like me) then comment out line 22 and uncomment line 23,
in order the extra stars to be almost-black (instead of almost-white).