There are more problems with psychiatry than what has been listed so far. I have watched the slippery slope happen up - close. The REAL problems in regards to application and practice of psychiatric science happened in the late 1980s as psychiatry and psychology slowly became what we know today as "Behavioral Health". The clinical model went from being focused on the patient as a whole person, from being focused on emotions and processing of thoughts, and their associated behavioral reactions; to everything being either a "negative behavior" or a "positive and desired behavior".
None the less, there was nothing human about human individuals anymore, because everything was some sort of behavior and everything became a symptom of something. The symptoms of mental illness became even the everyday acts of living. If you slept - in after a long week, you were depressed. If you ate more during one week and less on another, you had a mental illness. If you disagreed with someone else, if you had personality conflicts that involved being bullied or not accepted by a core group of people...you had a mental illness. If you had a headache, had an asthma attack, or any other medical problem, displayed ANY sort of emotion, asked any sort of question, you had some sort of mental illness.
I really DO hope they get rid of the DSM, stop classifying and categorizing people, start focusing in more on clear symptoms and start trying to get answers for the more vague symptomolgy, revert back to processing of thoughts and emotions as part of a focus on the whole person, and then use these other scientific methods such as various types of testing.