Grade scale(from worst to best):
Garbage--Games that should be avoided at all costs.
Dull--Seriously weak games.
Flawed--Broken games with redeeming qualities.
Decent--Nice and playable.
Great--A game with lots of fun to be had.
Excellent--An A-lister game in every aspect.
Superb--Utter masterpieces.
Legendary--Only the best games get these.