To what extent is the students' perspective on the lecturer credible? I am giving a master course with another colleague, but since I am more experienced in the subject, I took the most difficult lectures.
My lectures contain a lot of mathematical equations and require deep knowledge in algebra. I tried to make them as easy as possible and even made extra videos to explain parts which I felt were difficult. I checked all available lectures to make sure I explain well. Therefore, I find my lectures among the most intuitive and informative ones.
It seems that my students (or most of them) are not that good in mathematics and found the lectures very difficult. They are rating my lectures with very bad scores although I made a lot of effort in these lectures (I have been teaching this subject for several years) this year as they are online. I see my colleagues just recording their old lectures.
As a lecturer, I try to transfer knowledge, so satisfying my students is my priority. However, I feel that my efforts were not acknowledged and I have lost motivation to prepare good lectures. I am planning to simply record lectures and read the slides as most of the lecturers at my university are doing.
Did anyone go through this? Also, how informative is this evaluation to me? In other words, how credible is it to validate if there is really an issue with my lectures or if it is just a biased opinion?
EDIT
It seems that the students are comparing my lectures and the lectures of my colleague with whom I am sharing the course. I assume they think the difficulty of the lectures is related to the lecturer and not the topic.
Student feedback can sometime be a difficult thing for a teacher, and it is sometimes  inappropriate that teaching quality is measured in terms of student feedback.
Let me explain this by means of anecdotes. Imagine a colleague who is a good performer, much as a stand-up comedy act. They give good jokes, tell stories, show interesting films. How would many students rate them? Quite a few students might give them a good rating on the basis that they had a good time. However ask them in five or ten years time what they got  out of that class, and they might remember one of the jokes or stories.
Now imagine a colleague who works their class. Makes them do test and examples. Makes them go places that makes them think, makes their brains ache from the thinking they had to do. It is possible that quite a few students might really give some negative feedback that this was a class they did  not enjoy and might have liked to be changed. However, ask some of these students in five or ten years what they got out of that class and it might surprise you. It might be that they remember what they were taught and use it in their profession.
Good teaching can be preparation for the future and sometimes students can only discover that when they reach their own futures. I started to find this out when I would get unexpected emails saying &quot;remember me&quot;. &quot;I didn't believe you when you taught me that thing, and now I see that lesson playing out in front of my eyes every day. Thank You.&quot;
We have to balance those two aspects of teaching. We have to give them something for their now and something for their future. In fact something for our future and our grand-children's future, because that is what we build by good teaching.
As has been said by others: if you care, you will find ways to improve. You are doing the right things. Keep going. Best of luck.