I am not going to drop any spoilers here, but if you have seen any of the Saw movies, then you already know that the storyline of the Saw movies is pretty sick. The whole entire idea that the Saw movies have been based on is completely disgusting. Of course, there are sicker movies which have been released, such as the Hostel movies. All in all, however, anyone will probably agree that the storyline of the Saw movies is just plain morbid.
I was able to stomach the first Saw movie, although there is no doubt that it had its "moments." Saw II was a little bit grosser than the first movie, but there was only one or two parts that really freaked me out. However, there were long periods of time during Saw III when I was just completely mortified by the disgusting actions. Although I have never personally vomited because of a movie, I can honestly say that I came pretty close when I watched Saw III.
previous look at the Saw phenomenon - covering the first three films - I mentioned a personal fascination with film series' that go long, and the evolution that begins to occur within. I mused about some of the possibilities of how the Saw series might progress, possibly through introducing more humor (which may be welcome considering how deadly serious the series had been), or perhaps introducing a note of meta-commentary as a way of examining the omnipresence of the series as a whole.
One element of the series that had already started to develop in the first three films, and certainly continued throughout the next three, was the progression of Jigsaw/John Kramer as a sort of sympathetic anti-hero. While his methods are obviously brutal, since the death of character in Saw III the films have begun filling in his back-story and revealing the demented, but concrete, method behind his madness.
I will admit that the details of the individual films tend to run together in Saw IV, V and VI, as the muddle of flashbacks and "shock" reveals begin to take their toll. It also seems that we've passed the point of no return regarding the level of violence in these films - as the comparative restraint of the first two films has given way to an expectation of bloodshed that actually serves to reduce much of the film's suspense. If there's a device that is meant to mutilate someone, the filmmakers will inevitably be showing you the evisceration in grand detail - at least in some capacity. Anyone who has watched up to this point already realizes that nobody escapes unscathed, which is just how the audiences seem to like it.