Keith Mathison, associate editor of Tabletalk magazine and academic dean & professor of systematic theology at Reformation Bible College, offers his top 5 recommendations (with explanation) for every book of the Bible.
OLD TESTAMENT
Genesis, Exodus, Leviticus, Numbers, Deuteronomy,Joshua, Judges, Ruth, 1 & 2 Samuel, 1 & 2 Kings, 1 & 2 Chronicles, Ezra &Nehemiah, Esther, Job, Psalms, Proverbs, Ecclesiastes, Song of Songs, Isaiah,Jeremiah, Lamentations, Ezekiel, Daniel, Hosea, Joel, Amos, Obadiah, Jonah,Micah, Nahum, Habakkuk, Zephaniah, Haggai, Zechariah, Malachi
NEW TESTAMENT
The Gospel of Matthew, The Gospel of Mark, The Gospel of Luke, The Gospel of John, Acts, Romans, 1 Corinthians, 2 Corinthians,Galatians, Ephesians, Philippians, Colossians & Philemon, 1 & 2 Thessalonians,The Pastoral Epistles, Hebrews, James, 1 Peter, 2 Peter & Jude, The Epistles of John, Revelation
For aggregated reviews of Bible commentaries, see the website Best Commentaries.