Diablo 2 was a huge addiction for me in University. It got so bad that people would walk into my house and find not just me, but my other 3 housemates attached to the PCs playing together. At any time during the day or night.
I am glad they don't seem to have deviated much from the 'top down' style of gameplay from the others.
The suggestion that you may fight both the forces of the Burning Hells and Heaven as well brought up and interesting prospect during discussion with friends today. What if you have to choose your alignment (good or evil) and this limited the types of character you could be. I only thought this as the Witch Doctor seems to be very similar in style to the Necromancer (poisons, raising undead etc) so unless they have either removed the Necromancer all togther (BOOOOO!) or split the classes as I suggested, the two characters could seem slightly redundant.