I have 2 peeps in 2 different games that keep getting nailed with complaints. 1 of them is 55 and has been stalled at level 3 because every time she is ready to advance she gets popped with a complaint. The other did eventually make it to master despite getting "complaints" 7, yes SEVEN times! He still gets them but since he is a master now it doesn't matter. I think its similar to real life, some people are good workers, and others cut corners and do other things that cause them to get demoted or fired.