The one think I don't want to tussle with is actually rolling dice, which would be what listing individual skills and attributes would ostensibly be for. Giving stats to powers at least produces a sort of reference for the scale of our abilities. For instance someone with the power of Mega-Might 2 (super strength in other words) is as strong as a gorilla. Someone with Mega-Might 4 has as much power as a wrecking ball.