Can you share a few Guardian articles that are not opinion pieces or a journalist's personal column but still has "too much rhetoric in what should be unbiased news"?
The reason their extreme bias shows: https://theintercept.com/2016/12/29/the-guardians-summary-of...
This is a bit of an exception, because it is quite possibly the worst article I've ever seen them put out. But they definitely have a bias, towards the Clinton/Blair faux-left to the point where they not only dislike the right, but also the people like Sanders/Corbyn.
Edit: Apparently Assange didn't say the things the article claims. If so, it's just shoddy research on the part of the article author, and I'm surprised it hasn't been retracted.