I never considered Diablo2 to be hardcore, but I'll admit the players definitely can be.
I'm cautiously optimistic about Diablo 3.
That's why I don't understand where some people are coming from in this thread. Did we all play the same Diablo 2? Were some of you 6 or 7 years old when you played it, causing you to remember the game as much more difficult than it actually was?
Diablo 2 was not a complicated game. It was not a game that required much thought, and required only a minimal amount of planning because you couldn't respec your skills. The gameplay itself was fun because it was almost mindless. Stat allocation wasn't some grand, complicated system where you had to work hard to min/max - you put enough in stats to equip gear and dumped the rest into vitality. The most popular runs for items were short and fairly easy. Strong characters were easy to build even if you were just starting (see skelly necromancer/meteorb sorc). The game was more or less linear despite having some large areas to explore - Act1->Act2->Act3->Act4->Act5, repeat.

