But Torillian even assuming ME and PoP were both the exact same length surely 6hours of an amazing game has more value than 6hours of a good game. I mean if ME was say an hour longer than PoP but the gameplay was still the same I would still say PoP had more value. Value is a measure of the amount of enjoyment you get out of the game.
You say quality should have no effect on value but I strongly disagree. If there was a 20hour game but it was awful would you say it had more value than a 10 hour amazing game? I mean sure it's twice the length but you haven't had any fun in that time to actually value.