There are many groups who don't just try to paint it as a failure, they strongly believe it is one. No disinformation campaign needed, they just speak their firmly held beliefs and real perceptions.
Most of the actual failures fall on the provincial governments in my view. I think cannabis legalisation will probably be one of the few positive achievements history sees from the Trudeau administration although I hope I'm wrong.
Hasn't been perfect of course, but its far from the disaster certain groups are trying to paint it as.