If you want more Origins you'll be disappointed. It is restricted to one city, and the surrounding countryside. There are only few dungeon desgins that are re-used troughout the game (and i'm not talking about Bethesda style re-use: set pieces combined differently, but blatant copy-paste). Storyline has no big bad evil in it, just a a story of this Hawke character and his/her family's time in Kirkwall. Combat is faster and flashier than in Origins. The classes are more distinct with less but more powerful skills. Overall, not bad but nothing special either.
I hear you can get it very cheaply in some places now, and you'll get a code for free Mass Effect 2 (PC only) with it too. Also there's a demo on the net that shows how the combat and classes work.