I would agree that Dorian is super gorgeous... and normally I hate mustaches but on him it's grown on me. Really like what I've seen of his personality so far as well. The only thing that's made him not a front runner as a romance for me is that I'd have to play a man to see it. I just don't like playing guys... I will, just for him, eventually (something I never did in DAO or DA2) - but, it won't be for another couple playthroughs since I so love playing female characters when I have the opportunity to do so.
Edit, because I forgot: Just mentioning this in response to the surprise over the results of our absolutely-not-scientific romance poll
I imagine I'm not the only woman interested in Dorian's romance arc, it's just him being male-only does nudge him down on my 'dudes I want to romance list.' In regards to Vivienne, I'm not quite so idealistic as to think her race might not be a factor, but I definitely think her personality is off-putting to some. I find her really interesting, but the impression I have of her as self-serving, pro-establishment, and something of a snob makes me want to reserve judgement until I meet her in the game. I may well love her - like I did Miranda and Morrigan - but as with them I'd need to get to know her first.