Since I romanced her all the way from 1, and when I first played through 3, I was surprised that she called me "friend", and there seemed to be no different dialouge for relationships at all. It seems the most interaction with Liara is when your on the Citadel, which I think was a beautiful place for it. I still wanted some things that changed.
That's just one thing I do not understand. How hard could it have been to alter that scene to a romance variant? There really should've been one. The entire first part when Liara talked about Benezia and her buying her first history book (I think it was) could've been the same. The next part could have been replaced by something as simple as:
Liara: It feels strange, we are here while so many innocents are dying out there.
Shepard: *sighs* I know Liara. But we cannot save them all, no matter how hard we try.
Liara: But despite all this, I'm glad we can spend some time together. I've missed you...
Shepard: I've missed you too...
*Shepard puts his arm around Liara and the view zooms out and turns to black as Liara puts her head on Shepard's shoulder*
That's 4 lines of dialogue (6 since Shep's lines have to be recorded once by Meer, once by Hale) and a tiny variation in animations (that would be reused later anyway) that would've made this scene (imo) SO much better...