I found nothing particularly wrong with the game. The recycled dungeons got to me a little bit, but nowhere near as much as they seem to have for most people.
As a matter of fact, I can't think of anything wrong with the game. I noted some people complaining in reviews about how small errors made the game seem 'lazy', such as torch fire effects hovering beneath the torch, or Justice's eyes appearing below Anders', but I never encountered these problems. Perhaps the console version contains these problems while the PC version does not?
In the game's defense, I have never become so attached to characters. Even after putting between thirty to forty hours into the campaign, I want to see more of Varric, Anders, and especially Merrill. In comparison to Dragon Age Origins, which had a host of often irritating, tiresome characters, the characters of Dragon Age 2 were the highlight of the experience.
I also found the fast paced combat thrilling; just enjoying watching the character pull off a basic combo would never have happened in Origins.
Overall, the strong sense of forward motion attached to the story also added a lot to the game. In Dragon Age Origins, after 16 hours of gameplay, I just put it down because the sheer mass of the game was starting to drag, the story wasn't engaging me at all. I played Dragon Age 2 at every possible opportunity, loving every second and wishing they'd figured out how to add more gameplay into a single DVD's worth of six gigabytes of game.
So far, given the terrible Crysis 2 PC port (no advanced graphical settings to speak of), Dragon Age 2 is running parallel to Magicka for my favorite PC game of the year. We'll have to see if Red Faction: Armageddon manages to dethrone either of these