I love the fact that I was able to find my great, great grandfathers lunacy records - it's added so much more to him, his life etc and helped me form a much more real picture of him in my mind (though I really want to know how his finger got amputated now) - I wouldn't say they aren't nice records
That and the convict records of an ancestor are much more personal than many others and to me are part of the social history of my family tree - they are what makes them come alive and back to real people,
They may not cover nice events but they (both the records and the people) were real, and real life isn't always nice