i made a thread like this a while back. but to answer your question i honestly dont know, i have a lot of game idea's ranging from open to world to platformers. probably the only genre i wouldnt touch would be RPG's because i really dont have any idea's that i think would improve them and i dont play them so i cant judge.
though if i could start off i would start off with an FPS, i feel i would focus most an animation and gameplay. interactivity with object in the world is something almost non existing in the world of FPS, where ever you are your movement is the same, that needs to change. also melee combat sucks, the only one that has decent melee is killzone 3








