I just want to know if it will destroy the warm afterglow feeling I had with DA:O... the demo kind of killed my want of finishing the 2nd play through of O... but I heard some story elements were piss poor about blood mages and another group (not going into spoilers). Don't want a Matrix R/R experience.
I played through the first one several times. I think that the second Dragon Age is almost like a side story with some of the same characters. The end really depends on some of the choices you make, so just like the first one your enjoyment may be based on what choices you make throughout the game.
I have put many hours into the first one, and I absolutely feel that the second is worth playing and did not ruin the story. In fact, it really helped expand one character and some of the choices towards the end were very interesting to me. Just don't expect it to be as good as the first, because in most ways, it is not.