All you have to do is ask yourself if you're having fun. That's the most important point. You could be playing seriously or you could be stealing all the couches from the board room with the strength augment and putting them in your office. You can play for the story or you can just enjoying blowing dudes heads off. hell you can play the game by putting it in your console of choice or you can shove it up your nose. It doesn't matter as long as your enjoying yourself. So don't worry too much about it.