This book is good for the person completely new to data warehousing, as long as they DON'T take it as the complete or last word on the subject. Most of the basic concepts are presented well, but there are various errors in some of the specifics, and there are some theories described that are 'old school' and not necessarily relevant with todays technology (in the last 5 years data warehousing has changed in the capability of tools and in approaches & architecture).
RECOMMENDATIONS: If you are a business person trying to understand what your computer people are talking about re data warehouses, data marts or business intelligence, this is a good starting point.
But, if you are an IT/IS/computer person, skip this book and read Ralph Kimball's "Data Warehouse Toolkit", then graduate to his "Data Warehouse Lifecycle Toolkit" (covers many more aspects), and Bill Inmon's "Corp Information Factory". These 3 books, and a DBMS specific book (e.g. "Oracle 8i Data Warehousing") will be all you need for your first few projects.