Graphics horsepower does matter.
I think even the "graphics don't matter" crowd would have a very rude awakening if they tried playing some of their most favorite games on hardware one generation behind.
Super Metroid on an NES would theoretically be possible ... but it would be a worse game as a result.
Super Mario Galaxy probably could run in some state on the DS or N64 ... but it would again be a worse game.
Splatoon would be worse on the Wii versus Wii U.
Uncharted 4 would be doable on a PS3, but again it would be a downgraded game.
I do think system horsepower does matter. It doesn't replace the need for good gameplay, but it's important.







