That's fascinating seeing how you did it and that you enjoyed it. I've written over a hundred reviews for Amazon books but they're just short and sweet -- a way for me to keep track of what writers I like and the ones I don't. I find I'm most eloquent when I either love or hate it, the 3 star reviews are as meh as the books.
One thing I love having Amazon for is when I'm about 30 pages into a book and wondering whether to give it up or not. If it gets good reviews and people say something like "It starts slow but then really takes off," I'll keep going.
Right now I've started reading, "Snow Falling on Cedars." The writing and the descriptions of the little fishing village and the falling snow is just beautiful, so beautiful it's been putting me right to sleep.