Didactically this is a great book. It is written in a clear, accessible style, with lots of well-chosen examples, summaries and conclusions.
After a discussion of the Synoptic problem itself in the first chapters, the book mainly focuses on three subjects: Markan priority (was the gospel of Mark the first gospel to be written?), the Q hypothesis (which states the existence of a hypothetical written source behind the common material in Matthew and Luke), and the Farrer theory (Mark as the first gospel, followed by Matthew, and Luke used these two existing texts).
I believe Goodacre is right in adhering to Markan priority and in rejecting Q, but his defense of the Farrer theory is much less convincing. Although the interesting ‘editorial fatigue’ concept seems to support this theory, Goodacre’s most extensively discussed textual examples, the sermon on the mount/plain and the parable of the ten talents/pounds, in my opinion do not point in the direction of Luke using Matthew.
In the gospel of Luke Jesus starts his speech saying ‘Blessed are the poor, for yours is the kingdom of God’, and, knowing that Jesus is an Essene priest and that ‘the poor’ is a self-designation of the Essenes, Luke is simply blessing his audience (and himself) at the beginning of his speech. When Matthew has ‘Blessed are the poor in spirit, for theirs is the kingdom of heaven’ instead, this seems to be the unnatural start of a theoretical explanation.
The parable of the ten pounds/talents is even more weighty. Luke’s version tells the story of a king (or an emperor), while in Matthew any hint to a political reality is missing. These hints in Luke are numerous: ‘nobleman’, ‘far country’, ‘kingdom’ (or ‘empire’ - twice), ‘ten servants’ (Roman provinces?), ‘hated by his citizens’, ‘to reign’, ‘to give authority over cities’ (2 mentions, the first ‘over ten cities’, the second ‘over five cities’), ‘his enemies to be killed in front of him’. Did Luke add all these elements to Matthew’s politically neutral story to realize a consistent political account with the Roman emperor Vespasian as its protagonist? Or did Matthew eliminate all these subversive political elements to retain a harmless apolitical story?
I believe that in both examples Matthew has defused the politically loaded, subversive text of Luke, the first time by adding a few words, the second time by eliminating any political reference from the original text.
Although this is a highly informative book, I don’t believe the Farrer theory that Goodacre strongly defends in this work is strong enough to guide us out of the Synoptic maze. Maybe the early history of the gospels is more complex than this theory about the unilateral dependency of the gospel of Luke on the gospel of Matthew is claiming.