Everyone has bias. Members on this site always favor the redderick about the Bears. People I may have liked in the draft, I have a tendency to root for, people I didnt like , I tend to look for negative reviews.
5 people can look at a rep and have different opinions about it. You cant argue sacks and penalites but can assign blame to a QB or OL, or bad play call. Nobody likes PFF very much but they just look at every rep, and assign a grade. The bias is in how they grade a rep.
On the rep the defender took the inside lane on Braxton, he blew it but the timing of the play got us a TD. You can scheme a bad OL play where it doesnt affect the outcome. So in my outlook, it didnt matter he blew it. On a personal grade for Braxton, worse play of the day for him.
IMO, the only person on here that is somewhat lacking bias is Adam, he is critical and praise a player sometimes in the same post.