I liked this book as a travelogue. She wasn't trying to sell us on any one place, or any one mode of travel; she just took us through the journey as she lived it- the good and bad adventures, facilities, interactions and scenery.
Because she was traveling alone, talking to herself and her bike and dwelling on her place in the universe became a large part of the experience. Unfortunately that aspect doesn't make for great reading, but it would have been an incomplete story without the inner dialogue. I felt the physical exertion was under-played. All those miles were a major accomplishment.
I liked it mostly because I could easily imagine myself getting shoved around in ticket lines, hanging out too long in a comfortable campground in Portugal, and the bittersweet sensations of giving up new friends as the road beckons.