One of our other goals is to ensure our game controls and interfaces are easy to use so that players spend their time trying to master game mechanics rather than fighting an interface. Giving players complete freedom to choose “anything” with no direction as to how our systems are intended to work was a failure in our design. There was also a detached relationship between the bottom-bar UI and the skill system. We have six skill slots, and six spots to put skills, but the two interfaces didn't really interact, and stocking abilities in your interface felt awkward.
To fix these issues, we focused on two core changes: (1) exposing the skill design intent by categorizing the skills and (2) linking skill selection directly to the bottom-bar UI to make assigning skills a clearer process. When viewing the skill screen, you’ll be presented with your six skill selection slots; each of these correspond directly to your bottom bar, and each will provide a specific list of skills from which to choose. By providing a clear-cut guide on how to best maximize your build potential, we hope to cover that “easy to learn” half of the mantra.
We'd still like to see more monster variety-specific effects. There's no doubt, however, that the battle scenes of Diablo III are illustrated both gruesomely and beautifully (and we're not talking rainbows, unless you are referring to rainbows of blood).