Lord Tarin wrote:
I'll begin with C.S. Lewis. In his essay On Stories, he postulated that there are basically two kinds of books and subsequently two kinds of readers. One style of story is the fast-paced page-turner with ceaseless excitement and a constant rush of nerves, yet there is little depth to give it any meat or substance. To paraphrase Lewis, this sort of book leaves readers breathless and touseled but it lacks an underlying tone and mood, and gives no impression that London is different than Paris. 
The second type of book is exactly the opposite, less concerned about the action and more about the setting and environment. It, as Lewis said, "lays a hushing spell."
So with that in mind, which type of book do you write?
(I suspect that Lewis is oversimplifying significantly---there are other categories of stories, and other axes by which to divide them.)
When I've written as the mood takes me---basically like traditional NaNoWriMo, but before I'd ever heard of that---I've found I tend to write the first category, rushing breathlessly from one adventure to another in hopes that neither I nor the reader will catch up quickly enough to notice that there's never any real dramatic tension because the obstacles never pose any real difficulty to the protagonist.
On the other hand, the story I feel called to tell is certainly in the second category, which makes my task a difficult one.