I've played through the original Diablo and Diablo 2 and enjoyed it. Diablo 3 (in my opinion) is horrible.
I've played all the way through all difficulty levels and never died once. I never even came close to dying. When I fought any enemy, my health would never go below 90%, and within a few seconds, it would be back at 100%.
There was no challenge. The worst thing that would happen is that I'd get hit and my character would be "Slowed", which meant that I couldn't hardly move, and couldn't fight. It didn't matter though because my health would always be at 100%.
The really annoying part was that I'd get "Slowed" and couldn't fight back, but it didn't matter because my health would never go down.
I do NOT recommend this game.