It's alright. 
Well, the why is that his descriptions make him seem clever, witty, charming and cultured. Is there a little cockiness in there as well? It certainly appears that way, and that personally doesn't bother me. I don't mind a bit of cockiness and confidence. So long as he isn't impolite about it, and it doesn't seem he will be. At least judging from what we know so far.
I'm getting Rhett Butler vibes from him, if you're familiar with Gone with the Wind.
So that's just what has personally attracted me to him-- and the fact I find his personality attractive means I find his face attractive. That's just how I work, I guess? I'm not too fussed over Kaidan, myself, so while everyone is claiming he's the most attractive male Bioware has created I'm over here tilting my head. I can say people have a nice 'design', but I don't find them attractive unless I am digging their character. 
Back from work I have more time to answer now :
I understand why you expect so much about him but still, I can't become fan of any character with some pictures, a quick description and a few seconds in a trailer.
I just don't get that he's already being compared to Cullen, assuming he may (or even had to!) be a better character than him. I read it many times down here or elsewhere, if I quoted your post this was mainly to ask what A-Game was, not to criticize you, even less judge you, whatever Lolalei may think.
But Cullen, we've known him for 2 games already. Dorian, we haven't even met him IG once. So yes, my reaction is WTF ? And I assume it. 
And, as for the pretty face thing, I don't think I'm dreaming by saying that most people reacted on how gorgeous Dorian was, that he was definitely the guy to meet and romance, as if his beauty was THE ultimate criteria that determined his quality as a character.
That being said, it's perfectly fine to have a crush on him, to see his potential as a character, to speculate on him, but again, comparing a character we never met with another we already know, no I don't get it.
But that's fine huh, I was just speaking my mind.
That being said, I still wish to draw that funny scene I have in mind with Dorian and Cullen but I think I will refrain to post it down here, in case I hurt some sensibilities (yep, for me, Cullen is still the winner, unless my walkthrough in DAInquisition proves me wrong
)
And bonus :