Exactly while I really liked both Witcher titles they aren't that much better with choices and consequences than the DA games, well at least DAO.
I agree with regards to choices carrying over for W1 to W2, we'll have to wait and see for W2 to W3, just as we have to with Dragon Age series.
I do think the original commenter you answered to though was referring to choices within the single game, though I may misunderstand the wording. In any case in my opinion the fantasy worlds of Dragon Age and Witcher respectively are so different and the purpose and focus of the games are different as well, so while the Witcher functions extremely well with choices more often than not coming to 'choose the lesser evil', my personal opinion is that the Dragon Age series, which is a bit more light-hearted (not a bad thing), would not benefit from this. That said I do agree with the original commenter on that it is ok if sometimes Paragon/'Good' choices result in bad stuff happening and Renegade/'Bad' choices don't result in bad stuff happening as well as it often just means you're a jerk (at least I felt I was being a jerk most times I picked Renegade in ME/DA).
I love both game series because they are different, hopefully that will remain to be the case, and hopefully both Bioware and CD Project Red will pull off their fantasic stories set within an open world. More great RPGs cannot be a bad thing 