If he's waived, it's because a younger player earned his spot. I'd be shocked if he couldn't get at least a late pick back if we retained a little salary though.
Depends on the situation. If he got waived because he was miserable during the pre-season, I wouldn't mind it too much. If I felt he showed some promise of a better year but was still waived and then claimed, I would be pretty miffed about it.