I have not played D3 yet I am waiting for the reviews first to see if its worth 60$ anyway I've noticed some people are already playing on the hell difficulty setting. Is the game to short? to easy? both?
Normal difficulty isn't hard but its a great time to get in the story. I cant say too much about NM, Hell, or Inferno but I know you will have a challenge plus the game is awesome. I dont think you can go wrong with buying this game.
It's all relative. If you fly through on normal and start in with opinions then you could argue it's short and easy but that would be missing the point too.The challenge comes at the higher difficulties which correlates to a longer play time as well.
Currently I'm in hell, not playing super hardcore and I've got there pretty fast. However i don't think it lacks content/story, I think it is well designed and the lore itself is quite entertaining. As for difficulty I think it's a challenge from Mid NM onwards.