I felt very much the same. Especially the lack of focus on understanding the math. Especially linear algebra. Yes, it shows how to build a classic 4x4 matrix, but I feel there's a lot more which needs to be said about it when teaching this stuff to beginners.

Just looking at the chapters and reading a bit here and there doesn't give me a very good feeling. I don't like the approach, it feels like it focuses on the wrong things in the wrong order.