From what i understant its an MMORPG which goes back to the roots of Lineage 1 which was a mix of ultima and diablo, so its not even the same type of game, its an isometric mmorpg, not sure how this actually works out never played and ismetric diablo style mmorpg and i still think the WoW/Swtor combat model is much superior for pvp fights while the fun in Diablo comes from godlike powers and destroying hundreds of mobs, not a complex combat system.
Seems interesting anyway but you cant really compare it to Diablo 3 which is a single player RPG with some multiplayer elements. Its like playing Dragon Age Origins and saying this is how WoW should have looked like, both have similar camera and combat but are two completely different games.