After having the core D&D fifth edition books on my shelf for
well over a year almost three years, I finally had good cause to read them. (I'm a bit past the point where I can find the time to read RPGs just for the heck of it.)
I'm both surprised and delighted to discover how little of the Player's Handbook and Dungeon Master's Guide are actually rules for play: the (300 page) PHB's rules section is about 25 pages (with 175 for character creation, and 100 for magic-related stuff), and the DMG's section is roughly 30 pages, with the other 90% almost entirely devoted to world-building guidelines, advice, or examples of once kind or another (with optional rules from older editions of the game scattered throughout, allowing you to easily customize/homerule the system to whatever flavor of DnD you like best. Potion miscibility tables!)
It's weird to say 600 total pages of rulebooks represent a lean, simple system, but it really does. Good game.