The only major problems I have with Dragon Age 2 are as follows:
1. The fire looks like it was drawn in with highlighters. Do not like.
2. Remodeling the darkspawn was totally unnecessary. In my opinion, they looked 50x better in Origins...especially the Ogres..........
3. The fact that most of the dungeons are re-used MANY MANY MANY MANY times. They got old. Fast.
4. Dragon Age 2, from my perspective, really did not feel like a sequel to Origins. It had little, if anything to do with Origins itself. Sure it had many elements from Origins, like the chantry, mages and demons, the Circle, Templars, and darkspawn. But I just feel like this game had almost nothing to do with Origins in itself, other than a little bit of a change in backstory.
Other than that, I really liked Dragon Age 2. I wish they could have done more with the Qunari than they did. The combat was fast paced and fun, which was a refreshing change from the battle system in Origins. However, there are aspects of damage calculation in Origins that I do wish were carried into DA2, like Armor Penetration for example. I couldn't give a crap what my DPS was. There are some obvious flaws, but looking past them, DA2 is a good game in itself.