There are lots of spoilers in these reviews so SPOILER WARNING
The movie was decent enough. I'm not sure if it was actually based on a true story, but if it is it'd make sense. The scenes seemed to be a bit scatterbrained as if one were writing diary entries.
I also saw the review about the ******* coming out of nowhere. I'd say I kind of agree and kind of don't. Everyone's experience is different and as an impulsive teenager having all those things rampage around you just sets the stage up. Especially since it seems like he spent some time ruminating on it and hoping someone would notice his cry for help.