I spent something like three years at college, on a media course wherein drawing played some significant part. And I finished that course quite convinced that I categorically could not draw. Then, comparatively recently, I became bored enough to pick up a pencil again and give it another go - only to find out that I could draw fairly well after all (guessing my old college lecturer just wasn't a good teacher).
With some newfound ability, I thought to seek out a book that looked interesting - being a Lord of the Rings fan, this one caught my eye. And I'd say I made the right choice. As the previous reviewer notes, the first few pages alone prove invaluable, with Howe's techniques on sharpening and holding a pencil very quickly paying off.
The projects are all thoroughly engrossing and, moreover, rewarding - the satisfaction of finishing the Merlin project for the first time is, for someone who thought he couldn't draw at all, amazingly uplifting. Each project is quite different from the last, and geared toward teaching you something different; the Centaur project alone (my favourite) tutors you in drawing a mount and mounted figure, as well as weapons and armour.
I would note that, as Howe himself notes in the introduction (I think), the book does not contain a set method as some do. The steps in the projects are somewhat open to interpretation and, at times, trial and error will play a role for the reader. However, I believe I learned more through that trial and error than I might have from a more join-the-dots approach.
Ultimately, I would say that this book stands to benefit any given reader. A beginner stands to learn from and enjoy the book, and that enjoyment is just as accessible to a more advanced artist.