People really need to accept that not every conversation carries over to the next game, it simply wouldn't have been worth the investment of time and resources. Canonically, Shepard treated her squadmates well in previous games. For example, you can be a jerk to Tali in ME1 and didn't let her take the stuff for her pilgrimage...and she will still tell Shepard that she always loved him. Garrus always thinks he saved Shepards ass on Feros, Noveria and Ilos...and Shepard refers to him as a true friends, etc.
And every new Bioware game had some mandatory companions. Why am I forced to recruit Tali in ME1? Garrus or Jack in ME2? Dragon Age, Dragon Age2, Jade Empire....some companions were optional and some were mandatory. You don't like one of them? Better luck next game.
In ME2, you can greet Garrus in a nonchalant way, "Garrus? Is that you?" which leaves him rather miffed. You can greet Tali by threatening to gun down her entire squad. You can be pretty standoffish with the VS, and while Wrex's greeting is enthusiastic, Shepard's response doesn't have to be. Through this, we're allowed the RP flexibility to establish our relationships to all of those characters. Liara is the only one who draws Shepard into an intimate hug in a scene we're not allowed to skip.
Little things, but they tend to stack up.
@themikefest
Whatever works. If they were able to bring back Morrigan for the Dark Ritual after being kicked out of the party, the same could easily work here.