Would you care to elaborate?

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.