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FPS easily because it has the most generic checklist of how to make a game that should hypothetically be popular to enough people. Put a sci-fi or WW2 aesthetic and polish the aiming mechanics and, BAM. 

The over saturation probably stems from it being a more obvious group of decisions. When you're making an open world game, an RPG, whatever- there are a lot of roads you can go down. with FPS games these days they tend to stay in a few pretty consistent subsets (WW1/2, future-istic, terrorists/counterterrorists, etc.)