Not sure what people were expecting to see. The basic concepts of how the image of the black hole was captured and the scientific process to produce the image (separate teams without any contact with each other, etc) are fairly easy to grasph without a strong scientific background. The secondary 'story', about the people working with Dr Hawking on the information paradox was indeed a bit harder to follow - the concept is understandable but their talk was far too advanced and based on mathematics for the viewer to easily follow. But I doubt this is something that can be accurately simplified for the average person. I have a (little-used, if at all) physics degree, and I couldn't understand almost anything apart from the broad concept. I saw this as a documentation of a grand effort for posterity - not something aimed at explaining this effort to everyone else.
And in the end, you don't need to understand everything. If you watch this and you are not even a little moved and carried away by the scientists' genuine enthusiasm and passion for the mysteries of the universe, then the problem is yours.
