This isn't a review. There are plenty of reviews out there for this movie, and any old-school gamer worth his/her salt has seen this. I just think that every so often we should watch this movie, to sort of refresh the wackiness that resides deep down in all our souls.
If you don't own this movie, do yourself a favor and buy it on Amazon. Do yourself another favor though and skip reading the book it's based on. Or, I suppose if you are the kind of person who is into self abuse, go ahead and buy it (for a whole penny). It is kind of interesting in a sense, because it focuses much more on the personal issues of the kids involved. I don't think it blames "the game" much at all.
However, if you are looking for a far more interesting read, I definately recommend The Dungeon Master: The Disappearance of James Dallas Egbert III. I found this book fascinating, and couldn't put it down. I read it at almost one sitting. There is a detailed example of play in there that puts most examples in actual RPGs to shame, and I'm pretty sure based on what was said that the detective must have bought Moldvay's boxed set.
I leave you with this advice: Always obey your MAZE CONTROLLER!