I am curios if user rating can be trusted since some manga/manhwa/manhua that are extraordinary (to me) and in other "places" have decent ratings, have many 1 out of 10 rating from multiple users here.

Also, turning 180 degrees there are many (mostly manhua from what I observed) that are "trashy" from plotholes to dialogue and so on(personal opinion and also confirmed by ratings and reviews in other places). Those manhuas have many votes in the 5/10 area and nothing in the 8-9 area, but a whole lot of votes that are 10/10. Shouldn't those kind of users that have this kind of pattern be banned from rating since they are misleading others searching honest ratings/reviews?

I would understand if there was a gradual rise or fall, but in the cases I observed there are obvious ratings that are biased by something else than personal perception. Some manhuas have like 30-50 ratings in total and all of them are distributed between 3 ratings(e.g: 2-7-10). That's just too odd and statistically strange. Instead of having those rating distributed from 1 to 10 there are only two or three rating levels in a few dozens votes.