The former forward says the Magpies have been nothing short of 'diabolical.'
Indeed, the former England, Manchester City and Queens Park Rangers forward says he has watched the Tyneside outfit this season - and seen nothing except the diabolical.
And he doesn't rate McClaren's chances of lasting...
Marsh told Andy Goldstein and Jason Cundy on the Sports Bar at around 1am: "If you’re a Newcastle supporter, how do you feel?
"This season, they’ve been nothing short of diabolical. If Steve McClaren’s there at the end of the season, I will be highly impressed."
In response to Marsh's comments, there was agreement in the studio and the suggestion that Newcastle may be going down if McClaren is still at St James' Park by then.
Just what has happened to the 54-year-old? He's had plenty of ups and downs during his career and whether he is a good manager - not just coach - has always been questioned.
But, at Derby County last season, McClaren appeared to be enjoying one of his ups. He then proceeded to destroy Derby's season and looks to have continued in the same vein with the Magpies.
Newcastle may start winning soon and their new manager may succeed with time. But the signs aren't good. The coach is already shirking responsibility, not being firm enough on underperformers and looking very passive indeed as his side continue to struggle...