How to improve your stuff

This book's amazon rate is very good, but I don't agree it because Masafumi Oniduka only said that workers should enjoy their jobs and he explained only the classic strategies such as SWOT. If you have not read or learned the business strategic methods, this book would be worth to read.
He addressed there would be many chances and improvements on your tasks if you're a temporarily worker. I have much questions whether he knows the current terrible circumstances of the temporarily workers.