Technically, he didn't highlight, he used colored pens to write briefs and take class notes. And his tuition was about $3000/year, and books were $25.
I don't think law school is like that anymore. I think it's a worse case scenario, and I doubt you will find teachers like Perini. I think you need to take that book with a grain of salt. I think there's a level of competitiveness at Harvard that doesn't exist anywhere else. And Turow acknowledges that his personality added to his struggles. I think every 1L should read the book, and realize that if they ever feel like he did, they need to take a step back. But I wouldn't read it and decide if you can hack law school based on what he writes.