How well will Diablo III run on intel HD graphics 3000 (comes with the macbook air)? Will most of the character animations still run, or will the look of the game (physics, death animations, etc) be dramatically inferior?
turn off shadows and it'll run fine on High. However I suspect most of them are running a windows platform, so I'm not sure how different the Mac version of the game is. but in theory it should do fine. worse case you should get playable frame-rates on medium settings.
You can run Diablo 3 on Intel HD Graphics 3000 just fine as long as you play on a reasonable screen resolution (for example 1280x720) and you turn off shadows and anti-aliasing. I have written an article that explains the Diablo 3 video settings in more details and suggests the optimal ones for playing the game with Intel HD Graphics. If you are interested, you can check it out here: