1) It was difficult to read, not the language, but the style or pacing. Hugo would leave me hanging and move off for like 5+ chapters at a time on other subjects (Battle of Waterloo, etc). I found myself skipping many, many chapters.
2) I loved Valjean's story!
3) When I finished reading, it was around 12am and I experienced such a profound sadness I had to read something else to take my mind off of it.
4) I'm sure I have more to say about it, I just can't think of it right now.