I'm a fan of all things Psycho-Pass in general, but I was kind of disappointed with this movie. Not because of the characters, the characters are great. Masaoka was always my favourite enforcer and to get to see him again was very welcoming. I like that we got to find out Sugo, who up till this point had hardly any character at all, let alone screentime. Even the villains were pretty decent. One dimentional, but they're obviously there just for you to hate, and they do that well.
Instead my main problem with First Guardian is the timeline. I really feel this should have been set at least before Kogami became an Enforcer, if not even further back. The film is supposed to take place only a year before Akane Tsunemori joins the Public Safety Bureau. During the events of the film several places have large scale terrorist attacks, including the Ministry of Welfare itself. It's not that this isn't mentioned in Psycho-Pass 1 that bothers me, it's that this event would demand an increase in the security forces throughout Tokyo. A highly publicized bombing of a government building is going to cause crime coefficients to go through the roof. Yet only a year later the PSB and other police forces lack enough personnel to handle riots. There's a severe disconnect in what a terrorist attack of this scale would do to a city and what we see in Psycho-Pass 1.
I think the film was overall good, and again, I enjoyed the characters. I do think it needed to be set 5, or even 10 years in the past though.