Most of BBC3's output was at the "embarrassing end of drivel", according to veteran broadcaster Michael Buerk.
Earlier this year, the corporation announced that the digital channel is moving online in a bid to save £50 million a year.
However, Buerk, whose BBC career includes stints on The One Show, The Moral Maze and BBC Breakfast, described the show Snog, Marry, Avoid? as "cutting-edge tripe".
He told the Radio Times: "The BBC had BBC3, a channel much maligned in its lifetime, mourned unconvincingly in its passing, rather like Tony Benn.
"It did launch a few good comedies, but a lot of what I saw was at the embarrassing end of drivel. 'Britain's bravest youth media brand', as the BBC put it, will be relegated to the internet.
"We're told that's where youngsters forage for their entertainment these days, but everybody's still acting as though BBC3 has had a bullet in the back of the head."