It pops up all the time, it’s a waste of time and I’m sure it has been used countless of times to discard some piece of information. It doesn’t add up anything productive to the comments, people who comment don’t even say anything they actually think they just “did you know that MBFC says this so it has to be truth?” I could go on but I think you get the idea.
If it just ranked an outlets political opinion as left, right or center: no one would really be upset. It’s their effort to rank by credibility, and labeling centrisim as “unbiased” is fundamentally asinine; not “a few flaws”.