I don't think the plot works at all if you want to argue it wasn't 'real'. Not even the tag line 'Its the things we love the most that destroy us'. The rebellion is using the memory of Lucy Gray to psychologically torture Snow and he becomes obsessed with using Katniss and Peeta as dolls to prove what he has convinced himself over 60 years, it was all fake. But it wasn't. That's the tragedy. And its a tragedy that comes from a society traumatised by war. etc etc
One factor people seem to be ignoring in the mild success of this film so far is the Loki/Kylo Ren of it all. Pretty boy, complicated, romantic villain origin story is a win with the girls, who knew?