Jim,

You should take pride in the book because you finished it. When I wrote
an intro book to robotics, maintaining the self-discipline to complete
the book was by far the hardest part. I found that I was constantly
revising and second-guessing myself. I was fortunate to have several
people agree to review the manuscript and that helped, but just
finishing a long-form writing project is a very worthy accomplishment.
One of my friends who is an accomplished author told me that nobody
likes their first few works because when they look back at them they can
only see the flaws and not the good parts, so give yourself a break,
because it's not the start or end that's important, it's the journey. :-)

Chuck