I'm a pretty new MTG player - I've only been playing for a little over three months - and I bought this because the book looked like it would be beautifully illustrated basic overview of the decade long saga of the Gatewatch. I've been reading the lore - both books and web articles - and I was mostly looking for something that would fill in the gaps until I actually got to those stories and could dive into them in detail.
On the front of beautiful artwork, Rise of the Gatewatch is a winner. Mostly focusing on featuring cards, this was a pretty good intro to illustrations of the big five: Chandra, Jace, Gideon, Nissa and Liliana. There are short chapters for Ajani, Teferi, Kaya, and Bolas but they are significantly shorter, to the point where I kind of wondered why WotC bothered including them.
On the front of basic story overview, Rise of the Gatewatch is a failure. I've read all the characters' official origin stories (they were some of the easiest stories to find) and some of the information given in the character bios here is flat out wrong. For example, this book says that Jace sought out Alhammarret for training, but according to Absent Minds (the origin story posted to WotC's own website in the Magic Story archive) Alhammarret was the one who sought out Jace. The other bios are littered with minor, but confusing mistakes, similar to this one which shouldn't have happened because this book was published after those stories were published. Did not one from WotC bother to check the book and make edits where needed?
Overall, I give Rise of the Gatewatch three stars, as the artwork for the characters I was really interested in does not even out the faults of the basic story overviews, which is what I was really interested in. The persistent mistakes also make me a bit wary of purchasing other books of this kind from WotC.