I wouldn't say the AI was too bad, in fact I thought it was rather clever, the way you can bolt doors, and the enemies might find another way to you instead. I like setting trip wires and electrocuting them - seemed as capable as other games with it's AI. Maybe they fixed it with a patch though.
To call it scary would be a stretch - a lot of the game involves just paying attention, watching for traps, watching for door traps and dealing with them. But it's saw, a bucket full of syringes is not in itself scary, having 60 seconds to find the key at the bottom might be horrific, but it's hardly gonna make you jump. The best of the movies are tense, and I think the game achieves that tension as well, the tense puzzles right now seem very easy, but that might change as the game progresses. The game is best described as spooky, as it seems to be the standard shadows and stuff, rather than the often strange lighting in SAW. I mean, your more likely to see something disturbing in a SAW movie, brightly lit, vivid green hues in SAW3, warm home-style lighting in SAW2, harsh strip lighting in SAW1 - jigsaw takes pride in his work and likes to show it. In the game however, it's dark, just like every other game ever that is remotely like it. I think the steam engine would have made it look a lot more like the movies, better lighting etc - I'm sure it's the Unreal engine in SAW (yawn).
It's novel though, to play along as a 'victim', and not be 100% sure of what will happen next. Maybe buy it pre-owned for a console, rather than the PC - for one thing, I hate putting these shorter games on my PC, it just clogs it up for the sake of a couple of days gameplay. Get it pre-owned for a console if you have one, then sell it on when your done

, unless you have friends to lend it to. Same thing with the LOST videogame, short, interesting to fans of the series, but wafer thin gameplay. As I said, it's worth checking out, but wait on a real good price, wait until it costs what you would pay for 8-10 hours entertainment.