Learning Rails was a solid introductory guide to Rails. I feel like I now have a good foundation to build on, but some of that may be due to my previous experience with other programming languages.
The book, for the most part, sticks to the MVC and DRY philosophies of Rails. Unfortunately, there were some small sections where the authors broke from this without an explanation. For example, one code example puts DB Select code in the View, rather than the Controller.
However, my biggest gripe with the book was the high number of errata. If you read this book, make sure you have the errata page open on O'Reilly's website. Many of the errors could have been avoided had the authors spent a week to read through the entire book again.
All in all, the book was very helpful, but the errata turned a 4 or 5 star book into 3 stars for me.