The Demons’ 17-point loss to Collingwood on Saturday marked their fifth-straight defeat in what has been a disastrous campaign.
After making the preliminary final last year, Melbourne currently sit 17th on the ladder with a 5-15 record.
And Cornes believes Goodwin should be copping more heat for his team’s radical fall from grace.
“They’re just an irrelevant football club,” he told AFL.com.au’s The Round So Far.
“If you look at it, there’s 16 teams in this competition who turn up every week and you think well, they can win.
“I’m not surprised if 16 teams turn up and win but Gold Coast and Melbourne are probably the two that you don’t give any chance. That’s how far this team has slipped.
“It’s unbelievable when you look at the media landscape and the scrutiny some of the coaches have been under this year.
“Chris Scott’s been under more scrutiny than Simon Goodwin. Ken Hinkley’s eighth and he’s been under more scrutiny than Simon Goodwin, Don Pyke’s the same with Adelaide, he’s in ninth, Ross Lyon’s the same.
“Why is the scrutiny escaping Simon Goodwin? Melbourne just don’t know where they’re at.”
The Demons will look to bounce back when the host Sydney next Friday night at the MCG.