I liked it. I thought Pattinson did an amazing job. The subtleness of his acting as the slightly different personalities was a master class.
I thought the final scene with Toni Collette was out of place and seemed to be added last minute? It was just a sudden tone shift and had some dialog to try and wrap things up...
But it wasn't bad enough to ruin an otherwise entertaining movie. I think the problem is that Mark Ruffalo's character should have come off as very comical and satirical, which would have played better 2 years ago. But now? It hit a little too "currently accurate" to be funny.