There exists a time-tested Data Recovery Law - always verify recovered data.

 Many of the data recovery tutorials advise users to verify the retrieved data, but usually most people don't do it. So the following scenario may take place:

1. you extract files and documents and folder tree seems reasonably correct.
2. the disk is formatted or disk content is destroyed in some other way.
3. then you realize that the retrieved data is not recovered correctly.

It is evident you need to recover disk content once again. However, the original disk content is no longer available.
Moral of the the above is that you should verify the recovered data first and only after checking start to fill the original hard disk with new files.