It is always hard to find good commentaries on the whole Bible. Sometimes some are too shallow, and other times they are too deep or unclear; a good balance is hard to find. This commentary is fairly well balanced, but is more of a summary commentary, meaning it takes sections, instead of individual verses, and comments; though sometimes it will specifically interact with certain verses.
It is also hard to rate this book as a whole because each commentary section on each book of the Bible is done by a different author, so some sections on certain books will be outstanding, while others may be inconsistent and not as well done.
Overall I do enjoy this commentary and usually find some comments helpful for teaching or for my own personal Bible study. It usually gives a good summary of the passages discussed, though it may not answer the questions you have on specific verses; I would recommend a supplementary commentary written on a specific book for in depth study.