Dragonball Z. You know that the DBZ anime ended in 1996, but I always see a new one pop up every year or so. Dragonball GT: Final Bout was released since the anime finished in 1997, There has been 18 released DBZ games in 2000 onwards for consoles and 24 handheld games if wikipedia is to be trusted. Many of which have not made it to the west, but still, that's 42 games in 14 years. 3 games a year.

It's worse than any crappy yearly franchise like Call of Dooty, or "Ass"assin's Creed, or even Mario.