First of all. I didn't like the narration: Some unknown narrator was narrating someone's first person account about some uninteresting character. The rhythm of the story was so damn slow. It was full of descriptions and observations and there was very little action. The whole story was about some Mr. Kurtz who was supposed to be a very special person. I didn't find him interesting at all. All I could say about him is that greed had made him mad.
And I don't want to be too picky, but I thing it's description of the native "savages" was a little racist.
I liked the part that they had enlisted some cannibals and ran out of food and didn't know what to do.