[Angrist]

It needs to innovate and be a very polished, fun game. Oh yeah, push the limits of what's possible.

Examples:
Zelda Twilight Princess is polished and fun, but it doesn't innovate enough. Could have been so much more. So it's a 9 game.
Brain Training is very innovative, but it's not that much fun. So an 8 or 9.
Super Mario Galaxy is very polished, incredibly fun, but it's not a very revolutionary game. 9.5
Mario 64 and Zelda Ocarina of Time were both very fun, beautiful games that innovated and pushed the limits of what was possible. Both 10 games.