In XI, every single level felt like an adventure. It was always a challenge and that made it, almost always, fun because that's what people enjoy. I get some people might not want to have to deal with such challeneges on a daily basis, but, IMO, the sense of fullfilment is dminished because of the scarcity of such challenge. Outside of modern MMOs there is no game / genre that makes / forces its players to get to the last 10% of the game to actually enjoy its challenge.