The Interpretation series is a real mixed bag. There are volumes like Willimon on Acts -- not what you'd want for your ONLY commentary on that book, but an ideal 2nd or 3rd one (original, well illustrated, theologically interesting, etc.) Then there are volumes like Craddock's.
I expected alot from this commentary. Craddock is a professor of both homiletics and NT at Emory, one of the leading liberal seminaries in America. He has a long-standing reputation as one of the premier preachers of his generation. And yet, there was nothing worthwhile I could locate in this book. (At least not in the first few chapters -- I gave up after Luke 2).
The problems as I see them:
1. Generally way too brief.
2. Highly idiosyncratic in what he chooses to focus on. For example, on the annuciation to Mary (Luke 1:26f.) Craddock devotes just two pages and wastes most of it digressing on ancient near east views on angels.
3. shockingly, almost no practical application.
4. Spills too much ink exploring highly speculative (and sometimes dated) critical issues that would seem to have very little use for preaching (even if they WERE true). For example, in Zechariah's song at the end of Luke 1, Craddock spends one of the three short paragraphs wondering if this might have originally been a hymn of John the Baptist's followers, with an new ending added by Christians to reshape it.
5. Dry as dust, with an artless use of English (again shocking for one with a reputation for eloquence).
I could go on. For a decent, theologically aware homiletical commentary try R. Kent Hughes' 2 vol. work (1998). The volume in the Bible Speaks Today series (BST) is also better. If you want something theologically creative (if sometimes wrong) and practically oriented, while academically solid, try NT (Tom) Wright instead. That volume is what this Interpretation series entry OUGHT to be.