Maybe I'm a bit cynical, and haven't seen it but I don't think any TV shows do a good job of portraying any illness or hospital system, especially when it comes to psychiatric disorders which contributes to the stigma of it. They tend to exaggerate the symptoms and paint the person as a psychopathic killer or something. Granted, these people may exist but I am sure there aren't very many.
Sure, watch it for entertainment value, but don't take the medical bits on it too seriously.