Saw this when I checked my dashboard over on LINE Webtoon just now. Guess its true what's been said about LINE's rating system huh?
Personally, I view LINE's rating system the same way I do fan/general audience ratings on movie sites like Rotten Tomatoes and IMDB. Particularly, I'm into comic book movies (and this year has been HUGE for the genre as a whole.) since that's what I like being an aspie and all. Anyway, the two biggest releases this year has been Warner Bros Batman v Superman: Dawn of Justice and Marvel Studio's Captain America: Civil War. Predictably, one movie did well and the other not so much. (though I think we were all stunned when BvS got less than thirty percent on RT) As a result, fanboys, not fans, fan boys started downvoting the hell out of Civil War (and this was pre-release even) over on IMDB while BvS started mysteriously receiving lots of upvotes around the same time.
In short, what I'm saying is that I don't think a simple numerical rating is a good rule of thumb for gauging the quality of any product, not just webcomics or movies. Rather I think its an excuse for the average person to lazily pick a number from 1-10 based on shallow first impressions without having to actually sit down, read it, and write a constructive review saying what they like and don't like and in the case of big name reviewers is a cheap way to get clicks in cases where they pan a media product for seemingly no real reason other than to do it. (or praise a product that everyone else agrees isn't that good i.e Call of Duty)