Well, you're trying to take a game that's set in a Strategy game setting, and turn it into a MMORPG. You're going to lose some of the same feeling you get from a Warcraft game.

Also, if you manage to be a Guild leader, you may get back the 'tactical' feel of the game when you're coordinating a War or Raid.

Think about this: If they made Diablo into a Strategy game (somehow), wouldn't it feel less like Diablo and more like Warcraft?