I've played Diablo 1 several times since my youth, and I've played a staggering amount of Diablo 2, so I'm skeptical about this coming installment. The gameplay movies make it look like it's just "Generic Hack 'n' Slash 3: The Bloodening" or something equally bland. And what's more, the two revealed classes, despite their seeming complete difference in every aspect, have displayed basically the same spells/moves with different animations and little clouds that float around you.
Still, I have a lot of faith in Blizzard, I mean; Starcraft, Warcraft, Blackthorne(or was that Interplay?), and several others that I consider absolute classics. So I'll remain positive.