Balance..

eekeeboo: The challenge any game company faces is to not have enough balance to keep things challenging and allow players to motivate, not challenge too much to be futile in frustration. But this is why games generally settle on a set demographic of players who enjoy certain levels of challenge.    I personally enjoy a good grind and a level of frustration, though I will become somewhat annoyed I thrive on the sense of achievement and accomplishment when I've completed a set objective/goal.