Not at all. He's totally right, 8MP is completely OTT for an image from a computer game. If they're saved at full quality at 2-3mp that will be more than enough for decent editing in Photoshop. The only time you'd need 8MP is for printing at poster size and I doubt many people will even do that.
What if a poster print service was included as part of the game. You'd set up the picture and then pay via playstation network to have the poster printed and delivered. I'm sure plenty of people would use that
Either way, I had a picture from an old 3.2mp camera blown up to A1 size and it looked stunning. There really is no need for the extra resolution unless you want to cover a building.