As for the criticism that the last half is repetitive, thats the point ! Put yourself in the characters shoes and see what you would do.
SPOILERS!the problem is that i didn't care at all for the character so,seeing her being beaten to death,eating rotten food,pissing on herself,etc left me cold and it was even almost comical...the film looks like a kind of arty "Hostel".
I didn't like too the "sect",with the cheesy fat grandma delivering her pretentious,explicative speech about the "martyrs"...