This is a delightful family movie. The subject is quite surprising for a children's movie: it is about ghosts who are haunting a ship and a ghostbuster who does not actually chase ghosts, but tries to accompany them into the afterlife where they belong.
The acting is brilliant. All characters - certainly all the ghost - slightly overact but remain convincing enough. In the beginning they look like Addams family copies, but in the course of the movie they all become actual persons with feelings of their own.
The movie is sometimes a bit scary and is not suitable for children under six (it actually has a "6" rating in Holland) but since the ghosts belong to the 'good guys' (the antagonist a second ghostbuster who uses less friendly methods) the movie never gets really scary.
During part of the movie the audience can see the ghosts, but the other characters in the movie cannot. This was done most convincingly. The special effects are also surprisingly good, because there is some walking-through-walls of course.
The movie is mainly a comedy with some suspense, but it also touches ons some more serious subjects such as life and death, accepting your situation and interpersonal relationships.
All in all a great movie to bring your kids to, because it is very enjoyable for a mature audience as well.
