The only redeeming value comes from new modding options, the rest of the game is a farce.
The Bad: The overland map is disgusting. After running into four or five random encounters going from one small village to another, I just can't take it anymore. The trade system had zero influence into the game or events. The plot, party interaction, voice acting, and general atmosphere make me gag. This could be the worst RPG I've played besides Gothic 3. Also, many of the cookie cutter dungeons were reused from the original campaign. The lifeless towns with the same tavern keeper in every inn...I've said enough.
Conclusion: Buy this game only for the additional modding capabilities, and you should probably do so when it goes on sale.