I found this movie absorbing and it has left me exhausted having just watched it. I have read some of the other reviews and I do agree you have to get through the first ten minutes and allow the mum to be annoying, thats kind of the point. People often say somehting was a rollercoaster and this truly was. I lost count of how many times I thought, well thats a terrible stereotypical point of view only for one of the characters to call the other character out on it and thats how it goes on.
If you fast forwarded through it, if you didn't finish it then it is no wonder you found it boring or didn't understand it. It is from a play and is filmed as a play so there's no fighting or shoot outs or any real action of any kind. But the emotional turmoil is no less effective. The acting is top notch - actually if you do find the mum really annoying then that is really a compliment - and the ending is handled perfectly. It makes you think, it makes you wonder, it really is worth a look.