I loved this movie. When I read reviews here about people spilling wine on themselves while watching this because it was too "boring" and made them fall asleep, I just laugh and am grateful that I am not like them. If you are drinking alcohol during a movie, you are already going to be more tired. It is a slow movie, that is true. Slow doesn't mean bad though. However, if you are watching this movie and then want to judge it because it didn't meet YOUR expectations, then please don't write a review about it and give it 2 stars. Every movie has its own intention. Give it 2 stars if it doesn't make any sense at all or if the acting is just embarrassingly bad, but not when it clearly achieves its goal.
Sanitarium's intention was not to be a horror flick, it was to give us a perspective of the human mind when it is ill. You see, if you even cared 1% about what it's like for people who are mentally sick, then this movie provided you with answers better than any documentary, book or some other movie regarding the same subject.
The fact is that when you are mentally ill, you won't see the world around you the same as those who are healthy.
I highly recommend this movie and if you decide to watch it, don't watch it to be entertained, but instead to be educated.