I don't really agree with the critical main point about ME2 taking a step back in worldbuilding (sorry, love this game too much) but I do agree that Mass Effect often confuses beauty with good morals.
It's been a point of debate for years because the scars on a Renegade Shepard and Chakwas' words about them really reinforce this idea.
And it leaves me grumpy. Would Bioware have been so casual in the vorcha's poor treatment in-universe if they were beautiful? If they looked like the asari, would they have gotten an arc that improved their conditions in ME3?
The vorcha can be canon fodder, so I'm not surprised they have what people perceive as an "ugly" design.
But I think the situation with species can be a bit more complicated than that because we must never underestimate the misogyny in a dev team. Derek Watts can't even fathom women and children. If you have trouble designing female members of a species, there's something wrong there.
I mean, it's my personal opinion here, but I think Mass Effect is very male-centric, so yes the asari are beautiful, but men don't trust women they find beautiful or they project a lot of things into them. And while I have nothing but respect for sex workers, putting asari as strippers, dancers, barely clothed all over the games is not, I believe, about lore and how it makes sense for the different stages in an asari life. It's about the fantasy of those men working on the dev team, and also their need to acknowledge this beauty but in a way, to humiliate it at the same time. There are many quotes, even coming from asari themselves, that show they have little respect for sex workers. Which is INSANE to me considering the context they're in and the respect they should have. But it's not an accident. And even the Matriarchs are designed to attract and allure, with gigantic breasts and not even comfortable and protective armors.
And men's distrust of beauty can go very far: that's why asari's morals are always going from one extreme to another. They're peaceful, wise, everything you could expect from a species that lived for so long and seem to know so much, but in reality, the game tells us many times that they're also dangerous and untrustworthy. Illium, one of their planets, is one of the most dangerous places on the galaxy.
It implies that beauty -> seduction -> wrong morals -> watch out.
And their own beauty plays against them: they can't reproduce among each other without being judged.
And that's also why they're at the core of one of the biggest secrets hidden to the galaxy, as we found out in ME3 and the Protheans.
So idk, I'm not going to write a full essay here but I think beauty doesn't automatically mean the dev team will treat people or characters well, it just means they chase it and will spend more time on it, with sometimes a very clear bias as we see with the asari.
While I'm sure there are some that are attracted to these designs, I think most people would find them off-putting to ugly.
It's a matter of perspective for sure. I'm not attracted to species at all, but I do find the batarians extremely beautiful. I've always found it very weird how they're supposed to be ugly. Often wondering if I'm the only one thinking that way.