Ashley was too plain to me and too much of a 'tough chick'. The one that tends to overcompensate to be 'one of the guys'.
Miranda... I just couldn't like Miranda, because of that epic underbite she had going on. Seriously, i couldn't have been the only one to notice this. It put me completely off her. Either she had one hell of a swollen lower lip or her lower jaw was just so fucked up that it protruded constantly.
Surprisingly, while i thought she was weird at first, i thought Jack was fairly hot. I tend to prefer those kinds of 'crazy chicks', i guess. The shaved head, the dark red lips, the wild tattooes, the complete disregard for clothing, it all sells 'crazy' right off the bat.
And while i chose Tali as my love interest, i didn't include her (or Liara) because you're not meant to find either of them particularly 'hot'. Not like how they wanted you to view Miranda, anyway.