bob rae is a liberal party insider of the highest level, with all kinds of personal ties to the shady desmarais clan, which seems to be the high priesthood of canadian colonialism. he's been deployed in recent decades as a soft face for hard power, being used to negotiate with the native americans, or to document human rights abuses in bangladesh (no doubt while carrying out some corporate espionage for power corp). i've generally advised not to trust bob rae; he will appear to you in an appealing manner, and he will talk your ear off about whatever it is that you want to hear, but he firmly represents the deepest bowels of canadian colonialism, which is the petro-state.
that said, he's a smart and capable policy wonk and sending him to the united nations is consequently a fairly good position for him. this is perhaps a surprisingly appropriate appointment.