It appears that IMDB is hiding or deleting reviews under 5/10 for Amazon's new "Lord of the Rings" series. Several people are reporting their own reviews have now disappeared as well...
EDIT -- Edited the Title for a bit more clarity.
EDIT -- Edited the Title for a bit more clarity.
That said, removing 1-star reviews is not uncommon for shows that may get review-bombed. Metacritic and Rottentomatoes have both had to deal with it for movies/shows with... "zealous"... fans.