I found The Republic really quite entertaining! And it is surprisingly readable for such an old text.
It is written like a play where characters with real personalities have fierce and witty debates. It is rather fun!
I also read that one. Though certainly I also skipped some texts in college.
I don’t think they were arguing it was a bad or boring book — I think they were arguing that most students don’t have time/energy to do all that reading for all 5 or whatever classes they are taking every semester. I certainly didn’t.