IMDB has this for series shows but I think many site just average all the ratings under the series and of the series together to show a rating. If the books and series had separate ratings that might allow some interesting stats showing how the series is rated different from the books contained in it. Not sure anyone beyond a stats nerd would care but you never know. I have been using the IMDB rating of episodes to track my progress, so I know if I miss one or can take a break and come back. I'm not sure how users would use them; it seems mostly used as marketing by pages, i.e., "This group of things is highly rated, you should try it."

Yes, that woud be ideal for (binge)reading comics or manga as those kind of blend together for me.

I, too, would love this! I’m thinking of scenarios where I love the overall series and would give it 5⭐️ but not all of the individual books get 5⭐️.

Wheel of Time? Total 5⭐️ series for me. But, I don’t think there is a single book of the 15 that I would give 5⭐️ on its own.

I would love this feature! Especially since there have been series where I loved the first few but the quality fell off towards the end.

Gotcha! Thank you for the request!