The 1e ADnD Dungeon Masters guide may be the best DnD book ever written
I feel sorry for anyone who hasn't read this book, but I feel especially sorry for those who disregard it as some primitive relic of gaming past not worth the read. You are missing out on some of the best work ever written in RPG history, and even if you play 3e or 4e the advice and ideas from the DMG can still enlighten and inspire.
Although the ADnD DMG may not fully represent the golden age of the hobby, to me it represents the hobby at its best and loftiest. It still astounds me that I can open this book to any random page and find something that I can use in my campaigns, or find something that is just plain awesome.
So if you've read 1e DMG, read it again and enjoy, and if you haven't read it you should.
What do you think about the 1e ADnD DMG?