The film has shock value, suspense, gore and realism. I didn't have very high expectations for this film thinking it would be a typical slasher flick, but it really surprised me. I haven't been watching many horror films lately. Maybe there are quite a few good ones being made. Saw II definately delivers.
The film's plot has nothing to do with saws and I have not seen Saw I. Any horror film that gets me thinking is a good film and well worth the price of rental or maybe even purchasing for horror film enthusiasts. The main thing I got out of the film is that we all tend to conjure up our own realities and this can make or break us.