“The Facts About Luther” by Msgr. Patrick F. O’Hare, LL.D.
A good one would be Dr. Warren H. Carroll’s The Cleaving of Christendom, vol. 4 of his series on the History of Christendom.
The O’Hare book has no scholarly credentials as far as I know, and Carroll is only spoken of among certain conservative Catholics (i.e., his work is not known or recognized in the wider scholarly world). Daniel-Rops wrote on the Reformation, though it wasn’t his main area of expertise. Louis Bouyer’s *The Spirit and Forms of Protestantism *has a good analysis. Jared Wicks has written specifically about Luther in recent years, and among older writers Grisar (very hostile) and Lortz (much more sympathetic) are notable. Otto Hermann Pesch has done some of the most respected and detailed work on Luther (particularly comparing his theology to that of Aquinas), and some of it is available in English.
No I haven’t. I need to read more McGrath. At the risk of sounding snooty, most of his work is based on other people’s research, so he tends to be read by non-specialists more than by specialists. But of course we need people like that–indeed I’m more interested in writing for a broad audience than in writing detailed monographs (witness my participation on this forum).