When this is applied to webcomics, it's known as the "Miscarriage moment" named after the infamous miscarriage strip of Ctrl+Alt+Del.
"Holy shit. I think this video game series just had its 06 moment. I really hope this series either dies or improves. 1/10. -Game journalism website"
"Assassin's Creed 3, although generally well-received by critics, is known among fans to be the 06 moment for the series."