I recently felt like playing Diablo 3 again, which I bought at release and played for a month and then lost interest. I realized they changed a lot of stuff, but I cannot make sense of those difficulty levels. I can choose to switch a game to "hard" or more, and there is some advice about having good gear and stuff. But I cannot understand where Nightmare and so on went.
I created a hard game with my level 59 sorcerer, went into act 2 and faced mobs with 1M hitpoints, which pretty much killed me instantly. Then I tried normal, and again it was a very hard fight. The items those mobs dropped were something like 100%+ upgrades to my gear.
With this character I used to play in Nightmare before.
I don't want to read two years worth of changelogs, so my question is simple: Where did the Nightmare, Hell , etc, selection go, or how was the difficulty scaling changed between release and version 2.2?