I rarely give 5 stars because most missions are just good or okay. If I thought a mission was "great", I would probably give 4 stars. Of course, the person who rated your mission may have a different scale they judge by.
what I meant was that someotimes it seems like people click through without adjusting the stars. Perhaps it is because the default is set to 3? Is there a way to alter it so it directs the reviewer to change the rating whether it be 1 or 5 stars?