Joe Zappulla’s review published on Letterboxd:
There aren't any definite or indefinite articles in Room. Room is room, wardrobe is wardrobe, toilet is toilet. There isn't the need to specify these items with "the" and "a", because for Jack that's all there is. There are no other wardrobes for him to distinguish from, no other rooms. The film is at its most powerful when it portrays the incredibly harsh and dark story of the film through the optimistic and creative eyes of a child. A shed that a woman and her child are held captive in becomes a room of imagination and wonder for the kid. A tiny room can still be a track field, Jack just needs to run back and forth a bit. The real drama of the film kicks in as the cruel nature of the situation begins to seep into Jack's innocent view of the world. Ol' Nicks nightly visits are made all the more heartwrenching as Jack is forced to watch the man that keeps him prisoner take advantage of his mom.
The incredibly emotional nature of the film is brought home by the two incredible lead performances by Brie Larson and Jacob Tremblay. Their chemistry together is moving. They provide some of the most compelling mother and son relationships I've seen on film in a while. Brie Larson nails the nuances of her character, acting temperamental and on edge because of her situation but always with an underlying and core love and bravery for her son. Jacob has an even harder character to play, but he nails the childhood innocence and easily allows for the audience to enter his point of view. Lenny Abrahmson's direction here is flawless because he does get out one of the best child performances I've ever seen.
Room does have some pacing problems towards the second half of the film, but the moving performances and powerful point of view keep the film grounded with its emotional kick. Room is worth a watch just to see a different world through an innocent pair of eyes, a testament to the power of innocence and imagination in the battle against our cruel reality.