1. The voiceacting. The Death Knight is okay-ish most of the time -- his intonations remind me of HK-47. Unapologetically evil, matter-of-fact, and dry while at it. But everything else? Ugh! Some of them sound like they're being forced to do the voicing (at gunpoint? Dragged from a sickbed? Bad hair day?), and others sound like the students in my Lit. class when they were forced to read The Crucible aloud, i.e., emotionless, flat, and all-around awful. The thought of all dialogue in the game being voiced is filling me with abject terror. That digging ghost's voice made me want to scream and throw my speakers against the nearest hard surface.
2. The interface. What's wrong with DD's interface, really? Somehow, the new one seems, to me, less refined than DD's. It's chunky, awkward, and not very intuitive. Equipping an item is an arduous process. Going through the skill window to add a new skill is almost a physical pain. I can live with it, but not very comfortably. Is it just me, or does the interface... feel like something out of a beta?
3. Graphics. Samey with DD. Nothing to complain, but nothing to praise. Not much eyecandy yet. So-soish.
4. The new skill system. What were they thinking? Maybe it'll get better in further progression, but as it is, it feels clumsy and impractical.
5. Quests/atmosphere/story/etc. Since the demo's so short, not much can be said about them. But so far, the quests seem to contain the elements that made me like DD so much -- not just typical RPG quests (see Diablo 2/Sacred/Dungeon Siege/et all), but something with touches of originality and intriguing creativity. More Bioware-ish than Blizzard-ish. Hopefully, there'll be multiple ways to solve quests.
6. Imbalance. So mana now can regenerate by itself. Wonderful. But why does it regenerate so awfully slowly, compared to hitpoints? There doesn't seem to be any stat (e.g, "survival") that can increase the mana regeneration rate, either. This seems to favor melee characters far more than magic-using ones.