So I was hoping that at least one of the classes would import the D2 Assassin's game-play style. I like the idea behind the D2 Assassin, the closest thing in the Diabloverse to a Terran Ghost, being a Psionic super warrior. On the other hand I'd hope the D2 assassin's class successor would have the same abilities but not tied into the lore of the Mage Clans.
I've always thought the D2 Assassin was actually three classes in one, a traditional Rogue, A Psychic warrior and a "Standard" Warrior rolled into one. Her Martial Arts seems straight forward, She's a warrior, with an exotic fighting style.
Her traps make sense, they're technology that mimic magic. (And I guess that carries over to the Demon Hunter)
Lore wise, I can't wrap my head around the difference between her shadow abilities and Magic. They're both supernatural abilities that defy explanation, and can reward it's user with great power, why is her arts immune to corruption that even arcane magic isn't.
(If so why doesn't the Vizjerei fore go magic and develop psionics, Or if these are the human bodies natural skills why aren't there more assassins) Why are the Viz'Jaqtar (who are incorruptible) under the control of the Viz'jerei? (whos' had a history of being Corrupted)