I myself say it's all depending on these important things:
Gameplay
Is it fun or way too annoying to play.
Graphics
Doesn't affect much for tactic games and so on, but in some cases good graphics are plus
Storyline
If it's plain boring, then it's common that you have to force yourself to play it through, good story should be one of the most biggest things game developers should take attention to.
Music and SFX
If the music and SFX is terrible, it really ruins the feeling even if the game is otherwise perfect.
Final Fantasies are good examples on how to make Music and SFX right.