Boring!
To be fair, I've only watched the first twenty minutes of Room, but I find it to be terribly dull and uninteresting. Does it get better? It has a high IMDB rating, for what that's worth.
I'll try to finish it, but frankly I think there are MUCH better "Trapped woman" movies out there, such as that recent Cloverfield Lane film or even the classic Japanese avant-garde film Woman of the Dunes.
Brie Larson does NOTHING in the first 20 minutes worthy of an Oscar in my eye, so maybe there's more later on. I'll give it another chance tonight.
But the biggest reason I had to shut off the film was the kid. He totally got on my nerves, and I couldn't take it anymore. Most annoying kid in a movie I've seen in some time...