Because they're supposed to be an alien race I think there were some interesting opportunities for creating a very different genetic makeup available to the devs.
Well they had that opportunity in Mass Effect as well, and they didn't really take it then either, did they? The majority of the female aliens we see are Asari, and they're basically human women, except blue. They totally play straight into that old-timey sci-fi fantasy of the 'space babe'.
And when we finally see Tali's face, she doesn't look particularly different from a human woman. Meanwhile, the most prominent male party member across all three games is a giant gross bug with mandibles and everything. If they were aiming for non-traditional beauty, they should've made a female Krogan love interest.
When it comes to women generally, BioWare does not stray very far from traditional standards of 'beauty', while men have a wide range of appearances. Sera is freakin' adorable, Solas looks like a meth addict. Cassandra has a wide jaw? We have the villain from Legend. Vivienne shaves her head? Well we've got Cousin It over here.
Not that I really want them to stray away from traditional standards of beauty. If anything, I wish the guys were more in line with it. 