There’s a joke in our group saying… “slap Cthulhu on something and it becomes 100 times better.”
Not always true believe me… maybe it’s the other way; a game is successful and works so they add Cthulhu.
However a game that I’ve always had an “It’s OK” for has had it’s Cthulhu Spin Off and they have taken advantage of the change in the location to IMPROVE the formula.