Watching movies without any previous knowledge of them is how I experience them. Sometimes I might know the book, graphic novel or whatever source it is based on. In this case, I had no idea there was a book, therefor cannot compare it to it whatsoever. From reading from other sources it seems to be a good interpretation of it. I can only say that it has a nice vibe to it (guess the book had the same thing going on then).
Michael Jai White might seem to have the weakest character at first, but seems to have more going on (also acting wise) than some of the others. Everyone is having fun though and it's tough to really dislike the movie, I think. It's good little fun, even for those who didn't know what a "Freaky Deaky" is ...