Looking at EN World's reviews area, where the ratings of commenters are aggregated, it's interesting to look at which are the favourite official D&D books an which are less well-regarded. I've taken the items with 10 or more reviews and ranked them in descending order. Volo's Guide to Monsters is by far the favourite product, with Hoard of the Dragon Queen at the bottom of the list.
1. Volo's Guide to Monsters (95.5%)
2. Tomb of Annihilation (92.5%)
3. D&D 5th Edition Dungeon Master's Guide (92%)
4. D&D 5th Edition Basic Rules (91%)
5. D&D 5th Edition Monster Manual (90.5%)
6. D&D 5th Edition Player's Handbook (90%)
7. Curse of Strahd (89.5%)
8. D&D 5th Edition Starter Set (87.5%)
9. Princes of the Apocalypse (87%)
10. Deluxe Dungeon Master's Screen (83%)
11. Out of the Abyss (80.5%)
12. The Rise of Tiamat (75%)
13. Tales from the Yawning Portal (69%)
14. Xanathar's Guide to Everything (67.5%)
15. Storm King's Thunder (67%)
16. Sword Coast Adventurer's Guide (61.5%)
17. Hoard of the Dragon Queen (52.5%)
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1. Volo's Guide to Monsters (95.5%)
2. Tomb of Annihilation (92.5%)
3. D&D 5th Edition Dungeon Master's Guide (92%)
4. D&D 5th Edition Basic Rules (91%)
5. D&D 5th Edition Monster Manual (90.5%)
6. D&D 5th Edition Player's Handbook (90%)
7. Curse of Strahd (89.5%)
8. D&D 5th Edition Starter Set (87.5%)
9. Princes of the Apocalypse (87%)
10. Deluxe Dungeon Master's Screen (83%)
11. Out of the Abyss (80.5%)
12. The Rise of Tiamat (75%)
13. Tales from the Yawning Portal (69%)
14. Xanathar's Guide to Everything (67.5%)
15. Storm King's Thunder (67%)
16. Sword Coast Adventurer's Guide (61.5%)
17. Hoard of the Dragon Queen (52.5%)
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