What a let down! - SPOILER ALERT

Rating: 6/10 (9 November 2017)

I've scored this movie 6 only because it is well made, well shot, it's intelligent and attempts to handle difficult subject matter in a mature way.
This review has SPOILERS in so please stop reading now.
I liked everything about the Babadook up until 2/3s in when we are still unsure whether the Babadook is "real" and that I was watching a supernatural movie, or if the Babadook is merely imaginary and/or a metaphor.
The movie is paced really well. It builds up the tension and fear gradually and holds back until further on and keeps us guessing if the Babadook is real or imagined.
I'm afraid the movie lost me when I realised that the Babadook wasn't going to be "real". I felt misled by the makers. They extracted all the jumps, scares, and fear that a "supernatural" movie would be entitled to then cops out massively by making it all a metaphor for the mother getting over her grief, and anger towards her son.
OK, you might say that the fear and horror we went through before the reveal was justified because it made us feel as the mother might have felt but that didn't work with me personally. Just because it bravely deals with admittedly heavy issues does not excuse misleading us about the Babadook.
I don't discount the films usage of the Babadook. It could have hinted at or openly defined the Babadook as a metaphor or mental phantom, and scared us as much as it wanted. But keeping us guessing till the end was a disingenuous choice in my opinion and left me feeling cheated, let down, and disappointed when I really didn't want to.
I would have voted the movie 4 because of the massive let down. But I cannot do that based on all the positives outlined above.
This is just my opinion. Other opinions are available.