I love taking pictures with fisheye film cameras. The whole composition is in focus ... and it's such a big depth of field.
The other aspect to fisheye cameras is you never really know exactly how the picture will come out. Sure there is a viewfinder: But its not very accurate. Someone whom takes a lot of fisheye pictures might get good at it, but it will usually be slightly off. Therefore you basically have to take a lot of photos and hope for the best. You'll get a few shots per roll.