What is meant by MEPs, is that they give the kid mixed emotions,
Usually rude and nice. An example of an action using both, is giving the child(ren) plenty of gifts which they worked their butts off, (nice) but limits the time to only 15 mins or less, on weekends, even during summer. (mean/rude)
You'd want your child to really achieve the goal in the game, a real-life lesson. I doubt much is accomplished in 30 mins or less, per week.