That's not really fair - there are plenty of very good motivations for writing (and reading) fiction other than immersion in a sustained imaginative world. By that criterion, "Avatar" is a better film than than, say, "Casablanca," because James Cameron knows more about the flora of Pandora than Michael Curtiz does about Morocco.
Adams is a great writer precisely because of his lack of pretension, his humility, and his irreverence -- I'd be disappointed if he didn't regard his own work with the same outlook he had for everything else.
The grandparent is getting modded to all hell, but there is a genuine point here about the sort of writer Douglas Adams was. Not that he's a bad writer, but that he's the sort of writer who would say his main character has no existence outside the sequence of words designed to create an idea of this imaginary person in people's minds.
Some writers would consider their characters to have some kind of additional existence inside their (the writer's) own mind. They would "know" things about their characters which they never put into print; not to the level of what sort of computer they used, but certainly a more fully-functional mental model of the character beyond the words on the page.
Douglas Adams wasn't one of these writers, he was a writer for whom the characters were always to a certain extent subservient to the joke and the narrative. And Arthur Dent is a particularly strong example of this since there was never all that much to Arthur's character; he's essentially just an unidealised version of Douglas Adams himself who travels around the universe reacting to things in pretty much the same way that Douglas Adams would if Douglas Adams found himself with no home planet and no tea.
That's not really fair - there are plenty of very good motivations for writing (and reading) fiction other than immersion in a sustained imaginative world. By that criterion, "Avatar" is a better film than than, say, "Casablanca," because James Cameron knows more about the flora of Pandora than Michael Curtiz does about Morocco.
Adams is a great writer precisely because of his lack of pretension, his humility, and his irreverence -- I'd be disappointed if he didn't regard his own work with the same outlook he had for everything else.