A predictable 'best'
- the 1E Dungeon Masters Guide - without doubt the greatest RPG book ever published, it was a mess, but just so utterly inspirational, and full of juicy nuggets throughout.
Agreed. I
still reference mine, even when running games that aren't D&D, or even fantasy. Sometime in the early 1990s, it started falling apart (too many trips in a backpack in the first 7 years), so I removed the spine, punched holes in each and every page, which I reinforced with little round stickers made for that purpose, and put it into a three-ring binder. I believe the pages have actually outlived one binder and been transferred to a second. The pages have been color-coded along the edges, by chapter, for easy reference, and several passages have been highlighted. Yes, I'm no longer a broke teen/college kid and could have afforded a "special edition", when they were released, but that book has been loved. It just wouldn't be right.
And the worst:
- 1E Wilderness Survival Guide - unnecessary fluff throughout
Eh... I recall Dungeoneer's Survival Guide being worse. The isomorphic mapping wasn't a bad thing, but there wasn't much else. At least I used the random weather tables in the WSG. Both books were pretty stand-out as mediocre, compared to the rest of the 1E books, which were almost all pretty darn good (power-gaming accusations towards UA, aside).
Both the books that immediately came to mind were 1E books probably because that's the formative years in my gaming life. I still think the 1E DMG truly is of notably better quality, stylistically, than anything from at least 3E on. The DSG probably stands out because there were so few 1E books and most of them were pretty darn good.
From later editions, the standout good book would be the
3.5 Eberron Campaign Setting. Other than some 1E material (of which only the DMG and a couple Dragon mags actually get used), the only other non-current D&D books on my shelf are my Eberron material. The ECS is the core of that and Eberron is the only published setting that I actually get excited about -- I'm otherwise a pretty hard-core home-brewer.
I'm not sure I have another "worst" book. My pattern has always been that I get frustrated at some limitation of any edition of D&D, at some point, and move on to some other system before returning to D&D with the next edition. For 5E, the book I most regret getting is
Hoard of the Dragon Queen, which I just disliked for aesthetic reasons.