The difference between DAO and DA2 is that DAO offered no means to actually tell what line was what, or how it was delivered to properly evaluate an NPC reaction.
How did the Warden call Alistair a "royal bastard"? Was it an obvious joking tone, and Alistair joked back? Was it aggressive and insulting, and Alistair deflected it with humour? We *know* whether he approved or disapproved so the whole interaction becomes very confusing.
That's the problem. The paraphrase is a wholly separate issue from VO.
Again, I disagree; the means to tell the intent were the placement and presence of other lines. The nice lines were generally on top, the aggressive ones on the bottom, investigations and/or jokes in the middle. To take a look a the specific example you bring up:
1. What?! You don't think you might have told me this before?
2. So... you're not just a bastard, but a royal bastard?
Approves (+1)3. Doesn't that make you heir to the throne?
4. Why did you wait to tell me this?
#3 is obv. investigation/neutral line. #1 is on top, #4 is on the bottom so that makes them 'nice' and 'in your face', respectively. That leaves #2 in the middle as 'not aggressive' because that's covered by #4, meaning #2 is intended as a joke. (although whether Alistair would see the humour in it is up to him, in this case he apparently did)