Review of Planescape: On Hallowed Ground powered by the Slant community.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Divine interaction
Several chapters are dedicated to exploring the potential interests, intrigues, machinations and mortal interactions of divine powers.
Pro Real-world and D&D pantheon references
On Hallowed Ground details the gods of 20 pantheons, half of which are historical.
Cons
Con Missing some pantheons covered elsewhere
Notably, Deities & Demigods (1st Ed.) presents every historical pantheon in this book, plus American Indian, Arthurian, and Central American.