James hardly has anything to say aside from 2 scenes of drama related to that mission he did and n7 thing. Garrus talks about his family and being a leader, kaidan doesnt have much unless you have the citadel dlc. I barely remember anything with Liara aside from convo when you first board the normandy after mars, and then her meltdown after thessia, her little project and some crap about her mom. Even eawares favorite smurfette doesnt get that much. I just dont feel like i really bonded with any of them, aside from kaidan who i romanced in me 1, but thats only because of the relationship in 1 and the interaction in the citadel dlc, otherwise even that one would have felt dry.
I think you're forgetting the conversations that don't take place on the Normandy in ME3. In ME1 and ME2, you talk to people on the Normandy and that's about it. In ME3 a significant portion of conversations take place on the Citadel as well. Vega for example has two scenes I can think of immediately: getting drinks at the bar for normal soldiers and getting his N7 tattoo at the refugee shelter. ME2's characters didn't actually have many per-character dialogues. You say you barely remember anything except 4 conversations with Liara, but 4 conversations is already about as much as an ME2 character got outside of their recruitment/loyalty missions.
There are also things like the final conversation on Earth that often aren't counted as "squadmate interaction" for some reason.
The VS doesn't have much in general, that I agree with. They are the anomaly there, though.
Anyway, for the poll I voted Mass Effect 3, but I'll wake up tomorrow and change my mind to 2. I really can't make up my mind, similar to how I can't decide if Chrono Cross or Resident Evil 2 is my favorite overall game. In the end I feel Mass Effect 3 with all the DLC is the more impressive package than ME2 with all the DLC.