Sequels rarely live up to the originals. And in the horror genre that's even rarer. I reckon that 'Saw' (part I) will always be better, due to its originality and shock value, but its (first) successor does its best to expand on the mythology and give the audience something more. In short... it's definitely worth a watch if you enjoyed the original.
The first outing could be summed up best by 'two men wake up in a serial killer's lair and try to figure out how to escape.' However, there was far more to the story than just that and the amount of different twists and turns really struck a chord with audiences (that and the amount of 'body horror' that was involved.
'Part II' ups the ante in every sense. There are more victims in the killer's latest 'lair,' more gore, more traps, more police officers trying to figure out where these hapless people are, perhaps most importantly, more of the killer himself (who was surprisingly not in the first installment very much). In fact... out of all the characters in the film, it's the killer 'Jigsaw' (Tobin Bell) who steals every scene.
As with the first film, there's more to the story than just a bunch of people trying to escape from some fiendishly fatal death-traps. 'Saw II' does its best to keep the surprises coming and, like the first, you'll only have one chance to watch it without knowing all the plot twists that will be heading your way.
So, if you liked the original then you should enjoy this one, too. In fact it's almost like these two films could have been written together and filmed back to back. After this one I only stayed with the franchise for a couple more films as the quality really does go downhill after this one. For me the 'Saw' franchise was a two-picture deal.
