I noticed that there are some less popular manga and especially novels that have pretty much only 9 and 10 ratings which are reduced to some 7.5 because of bayesian average.

Most people probably wouldn't have much of an use for this, and it'd probably require stuff with very little votes( < 10 ) to be filtered out to not crap the top with manga with one rating, but I think it would be very nice when hunting for gems among the less known stuff.