The US Department of Justice puts out misleading information? Not saying I don't believe you, but that actually sucks quite a bit.
Either way, about the report - you interpret it positively, but it's actually quite indecisive on whether it was a good move or not. It concludes that there are indeed positive effects, but not as much as expected. It mentions a growing concern about the message decriminalization may be sending to new users and towards the end mentions that it's popularity may be waning and that it could go either way in the future. I still think some sort of decriminalization rather than legalization might be a better answer to some of the problems in America.