Whoa, I'm sorry you take it like an insult. 
You're perfectly have every rights to be enthusiastic. I think I can also have the "right" to wonder... why ?
And yes, FOR ME, Dorian is AS OF NOW, just a pretty face. A pretty damn good face. A wonderful design. And that's it. Sorry if you took it personally.
I hope as much as you that he will be a good character.
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. 