aka Il Fantasma di Sodoma
How bad is it? It's a very poor Italian gorefest.
Should you see it? Only if you're a Fulci completist.
WW II Nazis having an orgy in a secluded villa become ghosts that terrorize teenagers. It's about as imaginative as that sounds. This is not the worst movie Lucio Fulci directed, but it's one of his later efforts, which are at best shadows of his earlier work. There are some effective moments and some bad ones - there's really nothing interesting to say about it, except that it has shown up on some good/bad lists.