Well, i've gotta say that i was interested to watch it because of its catchy title and the idea about an English spoken film made by Indonesians (i reckon it's the 1st Indonesian film which used English as the main language in it).
The 1st 50 minutes, the film seems to be so dull with the shallow explanations, barely interactions from one character to another (unlike other previous Anwar's films), how kid characters ruin it with the way they converse in the forest poorly shows lack of thrilled & anxious expression, seemingly to be a shallow no-background story plot, and unsynchronized & unexplained details(necessarily prepared for the ending). All can lead the audience to a boredom and sleepiness.
Endure it, then the film will show you the worth of Joko Anwar as a writer-director and Rio Dewanto as an actor.
Anwar prepared an unexpected suspense plot mixed with some thrilling horror ingredients blending them all in the perfectly fit location, and served it to the audience with some quite decent cinematography. Dewanto as the leading actor made convincing enough expression and acting (great pukes as well) so that his performance made "John Evans" becoming a more interesting character.
After watching it, some questions may show up in mind regarding the background story that causes things that happen in "Modus Anomali" and how the story goes after the film ends. Generally it's a recommended nice flick to spend the evening with.
8/10.