As someone who hasn't seen the film and didn't even follow the fearmongering of the media did (seriously, what the hell happened here? Can someone explain?), I'm not sure what I'm in for. I am thinking of going to watch it, but I'm really tired of comic book films...
I can say this from personal experience at my local theater in a town of about 30,000: for the first time ever they were checking people's bags on the way in. We had brought in our own candy and they didn't even care about that. I asked what they were looking for and they said weapons. Upon leaving the film in the lobby of the theater was what looked like an armed security guard. I didn't look too close at what he was packing, but his vest was covered in several objects and I'll admit I was just more bothered by the fact that he was there to get a good look at his armaments, be they pepper spray, tazer, or firearm. I even asked if he was there for Joker, and he said yes, so I laughed at him and told him they were being silly.
I'm a bit done with comic book movies myself, but do still watch the occasional good one, and there have been many. But Joker is less comic book movie and more psychological study. It certainly takes place in Gotham and you know it is a comic book film, but they downplay most of those aspects and definitely don't reference other characters outside of the Wayne family.
I think it was very well done, but I'm also not surprised by that. Joaquin Phoenix is one of my favorite actors of all time and once I knew he was portraying Joker I knew I would enjoy it for his acting if nothing else. Todd Phillips (Hangover, Old School, Star is Born, War Dogs) is certainly creating a multi-faceted career in much the same way that Adam McKay has been (Stepbrothers, Talladega Nights, Big Short, Vice). I'm going to have to continue to keep an eye on his filmography.