Plot holes sink "Saw"

Rating: 3/10 (5 March 2005)

I caught this movie for free and have to say that I liked it for the first half. The second half sent me into a whirlwind of confusion and anger, mainly caused by the stupidity of the main characters.
This movie was what you might call plot heavy, and while some say this is its biggest asset, it is also its downfall. Everyone comments that it is just like Seven, and I can't disagree there. The basic idea is just like Seven.
However, the screenwriters failed to hammer out the little details of plot, and this is where it all falls apart. Having just finished watching the movie twenty minutes ago, I feel I have everything fresh in my head. So here goes, a list of plot holes in this movie.
1. The biggest and best hole is that the two characters trapped in the bathroom had no less than eight hours to figure a way out, and plenty of tools at their disposal. Yes, one of them had a family that was being kept hostage, but they could've turned off the lights or something. Also, whenever Adam or Larry try to saw through the chains, they always go at it like they were trying to saw off a tree branch. I'm sure that if they'd had a little more patience and kept their cool, they would have been able to figure out how to get through thick chains or locks with even a thin-bladed saw. Every chain has a weak link, just like this movie.
2. Danny Glover's character and partner are complete idiots when they zero in on the perp's lair. Why don't they call for backup? Once they have the place in sight, and know the guy's there, why not call for backup even then? Why didn't they bring in their radios or cell phones? How could the perp take a shotgun blast and get right back up (or if he was faking, how could he fall at exactly the right moment). And more importantly, WHY DID GLOVER'S CHARACTER NOT JUST SHOOT THE BASTARD WHEN HE HAD THE CHANCE, HAD A SHOTGUN ON HIM AND THE GUY IN THE CHAIR WAS GONNA BE OK? He had a split second there, and didn't even bother.
3. Okay, by the end of the movie we've discovered that Zepp had poison in his blood. Huh? What kind of poison was that again? It's never explained, except that it is supposed to be slow acting. Does that mean it's slow acting as in a matter of hours, days, or weeks? Because if it isn't going to kill him in the next day or two, then what's the big rush??? Zepp then has plenty of time to figure out a way around the poison instead of holding the Good Doc's family at gunpoint. Yeesh.
4. Seeing Glover's detective with all the stories pinned up on the wall gave me the impression that the other cops had already given up finding Jigsaw, or that all the other crimes were already 'solved' to the police's satisfaction. Just how else is it that the rogue detective is the only one still chasing Jigsaw? We've seen from serial murder cases here in the U.S. that the police rarely give up, even after 30 years.
5. By the end of the movie, it's revealed that the killer had an inoperable brain tumor, hence the motivation for trying to make others appreciate life more. Okay, I can buy all that appreciating life stuff, but what I can't buy is that someone who has a brain tumor would be functioning well enough to create all these complex schemes and carry them out without getting caught at least ONCE. Just what kind of brain tumor was that again? Was it malignant or benign...because if it's malignant, then the Jigsaw would have died after only a few victims (it's in the brain, after all), or he would be a vegetable. (And there would't be years of stories to make about him for the detective to put on his wall!) If it's benign, then there's no fuss.
6. And the worst ending of all time. Just how in the blazes does a person lie absolutely still on the floor of a dirty bathroom for hours on end? Especially a person with a brain tumor! I'd really like to know what part of the brain that tumor's on, guys, because some parts of the brain, when touched or pushed on by a stimulus (such as a tumor might be!) will actually make your limbs move, or make you say a certain word! It's been scientifically proved.
Jesus Christ, do not see this movie. It would be an offense to the intelligence of Koko the Gorilla, let alone a normal human being. (And Koko likes breasts too!) Possibly the only redeeming value of this flick is that it has great camp and after you figure out how dumb all the characters really are, you can start enjoying it for being bad.