I thought it was really well done. I don't mind the slow pace because it still sucks you in, as opposed to other movies where you just want it to get on with it. What bothered me however was the non-linearity of the first part of the film, and how open-ended it felt, both at the end and regarding the confusion of people when asked about Jimenez and about Melquiades' wife and family in the picture.
I wanted to give this a 3.5, but in the end I could not. It feels as though character development is lacking, and that certain scenes are drawn out or unnecessary. But at the same time, there are some very disturbing elements that suck you right into the movie at times. It's a shame that this was not done better.