I was actually pleasantly surprised in the Infinity Blade novel. I'm not sure what caused me to buy it, but I felt it was a pretty good book that gave a ton of depth to what very little you actually learn in the game.
I also really enjoy the Forerunner series in the Haloverse written by Greg Bear.
Lastly I've read a couple Diablo novels from the Sin War and the Elder Scrolls books. Neither were terrible and I enjoyed reading them, but definitely not anywhere on my must read list.
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