Instruct: Classify the given review into positive or negative sentiment.
Query: Very difficult to read

I am currently taking a medical ethics class at my university and find this book impossible to get through without forcing myself. The chapters are so dense that it takes for ever to read one chapter. That would be okay if it made perfect sense but even after spending a considerable amount of time reading it I still don't get the gist. I often look things up on the internet for a simpler explanation.