As for Supreme, well, yes it's pretty much a big pastiche. Which, amusingly enough and if Moore's words on his goal with that comic was trying to be is to be believed, makes it in itself one of his biggest failure. Basically, he said he wanted to "take a 90's superhero, and give him the depth and the symbolic power of a hero from the 30's-50's". Tough luck, the 90's hero he has chosen was Superman with an attitude, and what he did was basically remove the attitude and giving him Superman's old adventures, making him an effective pastiche with nothing that could link him back to his "90's hero" self. A very well done pastiche, with some nice explorations of things like continuities, reboots.....but one nonetheless.
I think Tom Strong was much better.