It's my opinion on those presenters above. What is the criteria? I don't know. It's just the 'vibe'.
It's the subjects they continually bring up.
It's the way they interview differently depending on who is being grilled.
It's they way they interrupt some and not others.
Surely you don't need me, or anyone else, or a book, or guidelines, to tell you how to think or form an opinion?
