It’d be nice if users could mark reviews as applying to multiple entries in a series, rather than just one. It’s hard to say for sure, but I think most people currently treat manga reviews this way. The clarity would be useful for reviews where the wording is ambiguous.
And for users who individually review each entry, a more convenient way to see all of a given user’s reviews for a series would be nice. Maybe arrows on the left and right edge of a review for previous/next review, and clicking them just replaces the element.
In addition or instead of all that, Natively could take a cue from Steam reviews and automatically show series progress alongside reviews - something like “X volumes read, Y volumes read at review time”.
