So as massive RPG fan, I've got both games. I can honestly say that Dragon Age: Origins is one of the best games I've ever played.
When I first heard that Dragon Age 2 was coming out, I was really exited (like really exited, I couldn't even sleep). Then it came out and... and... well, I can't stand it.
They've made the game into something else! It's more like 'Dynasty Warriors Gone Dragon Age'! And they've decided to make it a hack & slash, which for me isn't nowhere near as fun as using your brains and real tactics (conjure a good strategy they wont get you killed).
Also, I hated the fact that the entire game was based in one area (city). With Dragon Age Origins, you traveled all over the land... In Dragon Age 2, you rage around a relatively small city...
I want to hear other opinions! Do you think they screwed up with Dragon Age 2? Did you prefer Dragon Age Origins? What could they improve on when doing Dragon Age 3? (Yes, there will be a 3rd!)