I thoroughly enjoyed that!
If I say it's 5⭐ then that's from a Tolkienista perspective, so you'll need to judge for yourself how trustworthy you find my rating 😏
Groom has interesting perspectives on Tolkien's process, intent & legacy. I found it must engaging when dealing with Tolkien's life & works, the chapters on adaptations, principally Peter Jackson's films, marginally less so, though I'll return to the Hobbit films more open-mindedly.