I'll give a small list of things that can be actually PROVEN to be bad:
1. Plot holes. You can logically prove that a plot hole is a plot hole. Plot holes are bad.
2. Animation mistakes. That picture with the butler is obviously not what it's supposed to be.
As for your so-called "non-subjective" bad direction, I have news for you: it is subjective. Why? Because I disagree with people saying it's bad here; I like the way it's going (and so do some 100 people on anidb). There, owned.
Make things nice and clear for ya people?
That can also be looked at as mob mentality. As in, the Higurashi fanboys will claim all Higurashi related material to be brilliant no matter how bad it really is... then everyone else jumps on board to feel special. The people that don't give a damn about what the series is and actually like watching good anime are willing to see the flaws and point them out, instead of brushing them aside like they're completely meaningless or that they don't exist at all.
I can tell you right now that I am not a Higurashi fanboy (if anything, I have the mentality of a person that never sticks to one crowd). Moreover, I can hardly see how you would attribute it entirely to "mob mentality". I don't think that such a thing as "mob mentality" really exists much on the internet, especially not on anidb, because anidb users are some of the people with the least communication between each other, ever. If anything, I go there when I want really unbiased ratings from a large group of people. So far, I haven't really been proven wrong. If I see something that has high ratings and a large number of people rated it that, I generally haven't been disappointed (except for Bleach. However, bleach may be moreso the fact that it had a great start, so people rated it highly when it started out, but did not retract their votes when it turned to shit, and it went on for so long Anidb is more accurate for shorter series).
Also, I usually
pull up the comment sheets. To see if people had reasons for enjoying it. You can see that this isn't just blind fanboy rating. People are actually fine with the way it's going, and they have reasons. To give an example of this, there is
Minami Ke Okawari. In case you haven't noticed, even fans (or if you wanna call them fanboys) of the original, great anime did not automatically just start rating this one highly. It was promptly thrown aside as bad, though if you pull up the comment sheets for it, there are still people who liked it, and they rated it high.
I don't see why anidb ratings are just "oh, it's the bandwagon"... and even if it does have a bandwagon, who is to say that the bandwagon is made of peer pressure? If you flip the situation over and think about it the other way, isn't it just as much trying to be special when you DON'T hop on the bandwagon? People that even think thoughts like that are the ones that actually CARE about peer pressure. I'm just genuinely saying, not based on whoever the fuck's bandwagon, that I think I might enjoy this. Therefore, I'm CHOOSING to hop on the bandwagon and watch this.
I think that's the way things should be. I agree that there might be just a slight, tiny bit of mob mentality in that rating, but I think that it overall represents accurate opinions and should not be thrown aside just because you think there's a bandwagon and disagree in order to not be part of it.