The story and ending could have used some work, but what really makes the series is its mood. There are so many eerie monsters and creepy noises in corabination with that trapped feeling that the setting created. In a way, it reminded me of the movies Cube and Existenz, being a psychological mind-bender in an alternate reality. Even though the anime wasn't great, it had a very unique mood which set it apart from all other anime I've seen. Original anime are hard to come by so in spite of its weak ending, Gantz deserves its share of recognition.