This is probably my least favorite Saw movie. And it is pretty bad. The entire focus of this movie is how Hoffman became the apprentice and how he is covering his ass...but when it comes down to it, Hoffman isn't that interesting of a character. Furthermore, too many flashbacks are a bad thing. Did we really need an entire movie where the focus of the movie was for all intents and purposes, the flashbacks and character connections?
I think that is what is off about this movie. Usually the flashback or the twist is a shocking revelation that ties everything together. There is mystery involved. This movie lacked that. We knew Hoffman was the killer the whole time. There was nothing worth revealing to us. And that kinda sums up this movie...it really just wasn't worth the time. They could've done something interesting with Hoffman, maybe instead of him being a killer...his actions in Saw IV could've been him playing a unique game Jigsaw created for him, to keep himself or someone he loves alive and this movie could've further explored that, a sort of unwilling apprentice. And then Saw V could've further explained that. Instead they make him a two dimensional sociopath who became Jigsaw's apprentice cause of some lame plot about him get revenge on his sister's killer. And we get to spend an hour and a half watching him cover his tracks? Yawn.
Furthermore, the whole B-plot felt so useless. All of those characters were completely wooden. They weren't connected to the plot at all (except to frame Strahm which could've been accomplished in countless other ways), and were pretty much just there to build up a body count. I miss the psychological horror of the first movie, where it was about more than watching people get tortured. Hell, I miss the second movie, which had a high body count but the characters actually meant something, served the plot, and were well developed.
Furthermore, arson? Really? That is why these people were killed? That is their big sin that Jigsaw had to make them appreciate life for? What's next? [Creepy Tobin Bell voice]You hit a parked car and did not leave a note with your insurance information.[/Creepy Tobin Bell voice]
Overall just a really disappointing experience. The writers could've gone somewhere very unique and made Hoffman a character worth while. Instead they went down a boring, cliched road.
Also, I have a feeling Hoffman's test has to do with the note. "Perhaps you will succeed where others have failed." I think Jigsaw sent the note (or arranged for it to be delievered) to see if Hoffman was a worthy apprentice or would do as Amanda did and kill for selfish reasons, and create traps with no way to win. He succeeded in that case. He gave Strahm an out.
Oh, and how the hell are the Jigsaw killers affording these traps at this point? A room where the walls close. That can't be cheap.