1-Armor system. 2-Attributes are a husk of what they were. 3-Memory system. 4-AP limit. 5-Turn order. 6-No reliable way to make money outside of Lucky Charm and Thievery. 7-Magic damage has resistances and not Physical damage. 8-Psychic AI 9-Source as a mechanic 10-Lack of talents, even talent points, they are mostly uninsteresting and crappy.
Really disappointing to see how many things went wrong considering how amazing the first game was.
For more in depth information on this issues you can read this topics: