Is criticism good?

Criticism should make us better when taken in the right spirit even when it was meant to hurt us. There are people who are specialized in criticism, that is all they do. When people find fault and be negative about what we do and do not do in life, do not lose sleep over their negative words. We should not hate those who criticize us. Some criticisms are good in helping us to do self inspection, re-evaluation of of lives, attitudes and actions. We cannot stop people from criticizing us. Fault finders are everywhere. Jesus, John, Paul and Peter were criticized.  
 
Luke 7:33-35
33 For John the Baptist came neither eating bread nor drinking wine; and ye say, He hath a devil. 34 The Son of man is come eating and drinking; and ye say, Behold a gluttonous man, and a winebibber, a friend of publicans and sinners! 35 But wisdom is justified of all her children.

Song
http://www.youtube.com/watch?v=P6524am6TTQ&list=PL53D2823002E00626