A more accurate chart, or at least as accurate as any subjective chart can be, is probably this one from Sharyl Atkisson. The chart moves to to bottom from news sites to aggregators to opinion sites.
Otero's chat uses a deeply flawed methodology, but at least she kind of back-door cops to that, in that her methodology has changed with each update of her chart. Then again, pretty much every media bias chart uses a flawed methodology of some kind or another.
The biggest problem with these charts is in agreeing on the baseline, on what is unbiased. Because, when you say a news outlet is biased, the natural question that follows is, biased compared to what?
People are measuring not only the bias in which stories to choose to cover, and which ones not to cover, and how they are covered, but which politicians keep popping up on various networks and how they are treated, the tone of the discussion, whether talking points are allowed to steer the discussions, and even facial expressions of those involved.