Aristotle's Principle true or with flaws?

I believe that Aristotle's principle has more truth to it then flaws. When a particular task demands more of us, we usually enjoy it more. This is because when you have finished the demanding task it is very rewarding. We feel a sense of pride when we have accomplished that goal.
With Aristotle's Principle I feel it somewhat depends on the person also. There are some people who like to be spoon-fed and take the easy way out and then others are very driven and are very proud when then have accomplished something they had to work hard for. There is a huge sense of satisfaction when the task is over. This is why many people play sports or take part in other focal practises because they are more challenging and are very rewarding no matter what the outcome.