The most interesting thing about Reaper of Souls, the first expansion for Diablo 3, is that it’s an admission of guilt. Blizzard are one of the best developers in the world not only because it makes great games, but because it prods and tweaks and adds to them after release until they positively hum with glory. But Reaper of Souls isn’t a nip here and a tuck there. This expansion is Blizzard dealing with the reality that, in many people’s eyes, Diablo 3 just wasn’t very good. But can it be fixed?