The owner of my house just never did any work on the house even years before foreclosure according to someone who knew the previous owner. He could afford the mortgage until he left his wife and bought a house with his girlfriend. He simply quit paying on the wife's house and she couldn't pay the mortgage.
The house was in very poor shape, but I am told most of the damage was due to way too many people in the house and general lack of respect. The roof leaked and destroyed the main bathroom. The previous owner tore out the fixtures and that is as far as they got. It didn't seem like any damage was done because they were mad about the foreclosure.
I had a home inspection done and the only thing found that I hadn't already discovered was the attic wasn't vented properly. I spent a lot of time and $100,000 getting the house back into shape. It is like new in many ways now.