Some RPGs are demanding. While you can’t homebrew D&D into anything, it is still flexible and doesn’t demand that you play it a specific way. Some games do. There is no end of teeth-gnashing about this; for some reason people take more issue with RPGs having set procedures than, say, board games. But, as the entire indie RPG community knows very well, making a game for a specific purpose and experience often nets you a better version of that experience than trying to simulate it with a ruleset designed with breadth in mind. I’ve been having some revelatory experiences with such a targeted game recently; I will say though that when I say “targeted game” and “specific experience”, most are imagining a zine, something small, not a 600 page hardback with red and gold filigree. Yeah, I’m talking about Burning Wheel.
Reading a game and playing a game are two different experiences, which both teach you different things about the game text, how the rules work, and indeed whether the game is something you enjoy. When it comes to traditionally-styled RPGs, the big hardcovers with lots of art and glossy pages, the reading experience is placed often on equal footing with the play experience. Sometimes the reading experience ends up being better. Eclipse Phase is not quite like that. While Eclipse Phase is a game that draws readers in with a great setting, evocative art, and a fair dose of in-line fiction, the mechanics definitely hold their own, though the game has benefited greatly from revision.