1) Level scaling - ruins RPGs in my opinion
2) Guns - looks like I won't get my wish on this one but I hate guns in fantasy settings. Save them for more modern settings.
3) Few skills/customization options - I want to make the character I want, not some cookie cutter character. From what I've read so far I think this will not be a problem.
4) Boss battles where my carefully laid positions are overriden, My thief becomes unhidden and my mage is standing face to face with a big bad demon when he was originally way in the back. Do not force move my characters just so the boss can talk to me.