While at first I didn't like the title “Why is CSS Frustrating?”, I finally got to read it and it covers a few good points. I think I still don’t like the title much, since it seems to establish an incorrect fact, or rather a fact for some people. You could say the same thing about other languages and things to learn, depending on your experience, preference or personal learning curve.
The final sentence though makes perfect sense, and is a general good advice, not only for learning and understanding CSS.
Work with CSS, instead of against it.