In an ideal world (har har), I would give this book three stars because of its inconsistencies and its ill-conceived final chapter. We live, however, in an imperfect world and this is the only algebraic geometry book that I have read cover to cover. This isn't due to a lack of effort; I have wanted to learn this material for almost two decades, and this is the first resource I have found that helped me on my journey.
The book has a lovely informal style. The authors don't feel a need to impress the readers with their knowledge or cleverness. They start by using y=x^2 as a motivating example, thereby showing that most of us have already done some algebraic geometry. The book, like Gouvea's p-adic Analysis and Murty's Problems in Analytic Number Theory, is problem-motivated, and most of the work is assigned to the reader as short, do-able exercises. This works brilliantly in chapter one, and less well later on in the book.
As to be expected in a book with eleven authors, not all the pieces fit together seamlessly. The multiple definitions of regular functions, rings of regular functions, coordinate rings, and function fields do not always refer to each other, and it can be tricky to keep them straight. This is especially egregious in chapter six, where the book assumes the reader knows technical terms that are either undefined, or defined multiple ways earlier in the book. Chapter six does not tell the readers which of the earlier definitions to use.
I genuinely enjoyed the first chapter and working through the later sections on divisors and the Riemann-Roch theorem. I wish there had been more motivation for those two topics, but I feel like I am now comfortable with projective space, basic versions of the Zariski topology, Bezout's theorem, and simple divisors. I could not have said that before reading this book.
I feel like every chapter, other than the last, helped me grow as a mathematician. I hope that there is a second edition, and that it simplifies and streamlines the book. The books' problems are almost all due to ambition. I recommend this book, but take heed--do not read chapter 6.