The game part should take priority over the story part. That way, even if the story is bad, there will be a solid game. But a decent story with a bad game will just be something people would rather watch cutscenes on youtube for rather than actually play.
all I just need is a little "motivating" storyline that compells you a bit to play the game, even just something as simple as "something went awry and you have to fix it because you're the last man standing" is good enough to get me playing