So I've been playing a lot of SaGa and Mana games lately and I'm reaching the point where the few titles I own but have not played yet are ones that many fans describe as the "franchise killers" of the series which made both entries take a number of years before a real sequel was made and even then, both series have only recently climbed their way out of mobile purgatory.
So what makes a particular game a franchise killer? What are some notable ones that killed your interest in the series? Which ones did you feel were unfairly called a franchise killer?