Depends on your definition of bad. They changed the artwork; the Qunari look ridiculous. The darkspawn went from menacing to absurd.
I didn't think the Qunari or the Darkspawn changes were all that bad. The lesser Darkspawn definitely looked better in DA:O, but the ogres make more sense (appearance-wise) in DA2, IMO. I'm kind of indifferent about the changes to the Qunari.

The combat was button smashing stupidity; just click until the wave stops.
So, you played the console version, then. The PC version combat was very similar to that of DA:O. In both cases the combat on the PC version was very different...much deeper and more challenging. In fact, the tactical combat on Hard difficulty is one of the things that kept me playing.
The giant statue transformer battle at the end was so pathetically stupid I couldn't stop laughing.
Worse than Liberty Prime?

I actually did lol at that "battle."
The story was boring; the writing ranged from bad to pathetically juvenile. The game felt like a mod done by a bunch of randy college kids.
I'll give you that...the plot was hard to care about. The writing (as far as dialog) wasn't much worse than a lot of other games...Skyrim included. That said, it wasn't on-par with what I expect from Bioware.