I enjoyed the movie although I wish I hadn't seen the trailer in advance. If you haven't seen it and would like an idea of what it is about, check it out here. But don't watch the trailer if you intend seeing it. It just shows too much.
Both Judi Dench and Cate Blanchett were superb. It was hard to see who would win in the end. They both did or neither did. Take your pick.