I have a lecturer at university that I find very hard to understand. My lectures are taught in English, but my lecturer is of East Asian origin, and English is not his first language.
I find the lectures incredibly hard to follow, just trying to understand what is being said requires a substantial effort, and I find the material is challenging in any case.
There is no textbook for the course, but we are given printouts of the lecture slides that are used in the lectures (six to each side of an A4 page). While the lecture slides do contain the material, they don't explain it like a good lecturer would.
I've spoken to my tutor about the course, telling him that I find it very hard to follow the lecturers. Many of my peers feel a similar way to how I do.
Finally, let me point out that I bear the lecturer no ill will; I just want to do well on the course.