Believe me - we were very clear about our expectations. We discussed things like honesty in a very detailed way. Your expectations and reality sometimes just don't go together.
Maybe we are not lucky with nannies. However, when I speak to other moms in DC - they have similiar problems. Nannies watching TV instead of working, nannies ignoring crying kids, nannies feeding toddlers with chocolate, etc.
It's an old article but if you have a minute check it out:
http://www.cnn.com/2011/LIVING/08/17/real.life.nanny.diaries/