Good movie? Yes. Great movie? No, I didn't think so. The acting was quite good all throughout. I was pretty familiar with the story so for me it was just a little dull and drawn out. I'm not sure it needed to be as long as it was.
Would definitely call this a film, not a movie. Cate Winslet's performance was quite good most of the time; mediocre here and there; but on occasion it was some of the best character study I've seen in a long time.