Review of [REC] 4: Apocalypse

I found it boring to the point I fell asleep and had to watch it again the day later. I had to watch it again from the beginning because I even forgot at what point of the movie I had arrived. I don't understand why some things established in the previous movies weren't done here, for example leaving a crucifix on a door would prevent the infect from leaving said room, or praying would make them stop. Both are thing used well in the previous movies, but here were not used because they would have made the movie last less than five minutes. That really bothered me to the point I could not enjoy the last chapter of this saga.