One of the marks of excellence is using criticism constructively. Looking at things from another's viewpoint is a great way to improve whatever product you have which could be yourself, a business, a project, and the list goes on and on. Sometimes people give their critique in a manner that it is so painful and even insulting sometimes. The best thing you can do is cancel out any profanity they used in getting their points across. Those are bones. Leave the bones alone as they say and take the meat. There is some value if you look hard enough.