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I find two distinct reasons why people may dislike or speak against a news source :
1. Quality of investigation, journalism, writing, reportage
2. disagreement with overt or subtle position, bias and perspective
Fwiw, Without detail, your comment is automatically presumed in category 2.
I for one find guardian very opinionated and biased, but eminently readable. It has a very overt perspective, but it generally has good quality writing. I would not make it my only / primary source, but I don't automatically shun it either.
It's the left-wing equivalent of the Daily Mail.
I presume only by people who don't know what yellow journalism is as I was quite clear as to why I believe the guardian to be a failing rag.
Roughly equivalent to tabloid journalism in the UK. Although the newspapers of the era did serious reporting as well.