Mmm....I think there isn't going to be a satisfactory answer OP.
Everyone has different ideas of what makes a character 'attractive'. I'm not sure one can really generalize (which is how I'm reading the statement regarding gay men finding Dorian attractive) (please note, I'm not trying to be accusatory, but I just want to point out that there are probably gay men out there who were not enamored by Dorian's appearance, given that everyone has different tastes).
I've seen many posts from different using bemoaning the fact that they found all the straight male romance options ugly, and from others saying all the straight female options were also ugly. I think the answer to those posts is similar to the answer to this post. Everyone has different tastes, and everyone has a different definition of attractive.
I found the majority of straight female romance options attractive, though not necessarily what I would define as classically attractive (an example of this idea, on the males side, would be Anders, who's jaw is perhaps a touch too narrow for classic Hollywood style beauty. Nevertheless, he was my first choice when I played DA2). I personally found Isabela much more attractive once I gave her pants (modded). I never found Merill to be that attractive. I thought Morrigan became much more interesting after they redid her in Inquisition, though I've seen various posts muttering that her appearance should never have been changed.
I think there isn't a whole lot to say. If some who preferred Isabela's looks in LI options were disappointed in the options in Inquisition, I think others who preferred differing physiques were likely pleased by the options presented in Inquisition.
TL;DR you win some, you lose some.