This review is from the perspective of a pure math major. I hold an interest in this class mainly because I believe it helps with understanding graduate-level math. Professor Rubin is a great lecturer, as he did a great job explaining the terms and answering our questions. He is also very helpful in office hours and is easy to approach to. However, I do think the pace of the class is a bit quick since we basically skim through the whole textbook "Category Theory in Context". We didn't have a chance to learn many things in detail, and many useful facts are left out for us to read in our own time. I used a lot of textbooks and notes other than the recommended ones, and they turn out to be helpful for filling in the gaps. Another problem is that the concepts are sometimes way too abstract and it is difficult to figure out everything without having an understanding on them beforehand. It would be helpful if you have experience with graduate-level algebra (i.e. MATH 210A), or have read the Algebra book by Serge Lang since they give you a focus of Category Theory on abstract algebra (groups and rings).
Overall, very nice professor, but very hard class (at least for me).

Here are the grade components:
Homework (75%): weekly assignment containing 6 problems each.
Final (25%): take-home exam with a 2-week window to figure everything out.