I will rate my games according to:
Theme:To what extent does the theme come through during play? How much fluff and background story is described in the rulebook? How interesting is the theme to me?
Gameplay: How original, intuitive and elegant are the ruleset? How well does the mechanics simulate what they are supposed to simulate?
Rulebook: How well are the rules written? To what extent are key mechanics illustrated with examples? How many rule ambiguities are there? How easy is it to find specific rules?
Components: How thick and sturdy are the cardboard and cards? How detailed are the miniatures? Artwork quality?
Funfactor: How much do I enjoy actually playing the game?
Value: Bang for my buck. Do I get a fair amount of gameplay and components for the money spent? How often will the game actually hit the table?
Average: This is the mean rating of all the aspects mentioned above.