There is no standardisation for the art of acting!

Anything comes under acting.
But when asked to do something that resembles like a reality it is still an ill posed question. It is because every human being has its own way expressing sorrow, bliss,  anger or happiness.
  Somebody may tend to laugh when they are sad and somebody cries when they are happy.
  So I believe there is no way you can judge somebody's  acting skills by your own perceptions on emotions.