If everyone knew that the real developers of the original franchise and the first half of the development cycle of Diablo 3 were developing Torchlight 2 after quitting "Blizzard North", I doubt it would even have half as many sales as it has today.

You can understand that they solely made this game to turn an incredible profit out of a paltry amount of man/brain power. Most intelligent development studios would increase difficulty in a game by increasing the components required for the AI of server 'creatures' to interact with the players. Diablo 3 sadly only increases the static attributes of everything in each difficulty level. Take Guild Wars for instance. That game requires more advanced tactics and critical thinking as you progress through the missions as the creatures use more devastating abilities and combine different attack and defense strategies as you progress. Diablo 3 does neither of this. The mobs react the same way through all difficulties which takes hardly any dynamic thoughts or development strategies to put together. I've played Flash games with more thoughtful dynamics.