.....Yes you do, more disk space = longer games with more content. Better looking games = more detailed content and prettier content.

What would you rather play, a 3 hour game with no extra content, or a 50 hour game with craploads of content?

What would you rather play, a nes game where you can hardly tell what the character your playing as looks like, or a modern game where you can tell what your character looks like, not to mention give more detail to your surroundings.