The writer of The Newsroom told Metro that market forces meant that all stations had to attract viewers, leading to important but boring stories being trumped by "more entertaining news".
"I think, in America, Fox News is the worst culprit but the best depends on what hour of the day it is," Sorkin said.
"My problem with Fox is not the Republican aspect - the 'redness' of it - my problem with Fox is, I think, that it lies. They consistently mislead their viewers."
He added: "A recent poll showed that Fox News viewers are less informed than people who don't watch any news at all.
"On the day the US invaded Iraq, 67% of Americans thought the country had been attacked by Iraq on 9/11."
Sorkin continued: "I was in London during Hurricane Katrina and watched the BBC news coverage. That was the first time I ever really watched news about America at length while away in a foreign country.
"I could not believe the difference in the coverage compared with US news - it was night and day. The BBC is fantastic and, saying this doesn't make me a member of al-Qaeda, so is Al Jazeera."
Sorkin has explained that The Newsroom is set in a fictional cable newsroom, rather than being based on MSNBC, Fox or CNN.
Watch a trailer for The Newsroom below: