They rate CBS News and weather channel as “middle” and “reliable”.
Ad fontes media are by no means perfect, but they are generally the best in the field. Unlike some of their competitors they don’t rate Reuters and AP as left wing lol.
Obviously reliability and bias are subjective — as is everything in the social sciences. But that doesn’t mean attempting to quanify it is not useful. It’s subjective to quantify democracy for example but the economists democracy index is useful — or the Human development index etc.