Add % of episodes watched in comments
I find very annoying to look for reviews of a show only to see people have given it a 1/10 after watching just the pilot. So I think it would be nice to display, next to the comments, the % of the series seen (just like, for instance, MyAnimeList does: see https://myanimelist.net/anime/9253/Steins_Gate/reviews for example). That way we can see that someone who has seen the full series may have a stronger opinion to give.
The watched % is now there in comments! Shows and seasons will have the %, movies and episodes have a play count. It is also a link to view the user’s specific history for that show/season/movie/episode. I agree it is a great help in determining the credibility of a comment.