Well, they were all present in ME2, just not as squad mates. I have to admit, at the time, I was a bit upset that they removed almost my entire ME1 team. In retrospect though, it was not a bad call IMO. It made the world seem bigger and less focused on Shepard when this happened. It also made sense (for the most part) that they wouldn't join you. Wrex especially was handled very well in EM2, I think. The game has many problems but taking your squad mates and having them go their own ways was not one of them.
BTW, I'd say the same of ME3. A lot of people were upset that we couldn't re-recruit all the EM2 companions anymore but IMO, for almost all of them, it made sense that they had other priorities and responsibilities now. I thought it was great that we had a lot of friends out there and that life was not condensed to the Normandy.
Similarly, I liked the approach in DA:I that you had companions and friends that were not necessarily coming on missions but had other duties or specializations. I hope we'll see such an extended social circle of the protagonist in ME:A as well.
This didn't work for some characters. Miranda, Jacob, Kasumi (as much as I'm ambivalent to her), Samara, and Zaeed were all given rather shallow excuses not to rejoin you. We never get to outright see them doing anything spectacular: Kasumi at first refuses to join you just because she doesn't want to do anything more than relive her Keiji fantasy, Jacob has to "protect" the Cerberus scientists, Samara has to fight the war off on her own, Zaeed has to talk to some old buddies and hang out in the refugee sector of the Citadel. And don't get me started on Miranda. It's great that she's the only squadmate capable of dealing with her own problems on her own, that's one of the reasons why I love her. But to retread her entire story from ME2 and outright ignore her contribution and role in Cerberus (and how it could affect her position in ME3)? Going by this portrayal in the game and developer statements (Hudson explicitly described Miranda as a "temptress figure") makes one conclude that they really weren't that fond of her character, though to be fair, I'm grateful for what we ended up getting in Citadel (which in all honesty actually enhances her to being probably the best romance for Male Shepard)
I'd be more receptive to this point of view if it didn't mean that every character sans the Dextro's (who I count as part of the ME1 team) weren't all absent.
It seems in many ways that the Dextro's were put onto us without reason (Why wouldn't Tali be working more with her people or on the Crucible? Why isn't Garrus working on the Turian war effort instead of following us around again?).
Shoot, Liara was all but forced on us as well. She's the Shadow Broker, and she has a huge, vital intelligence organization to run, coordinating her resources to work on the war effort, yet she's totally available to go on every mission with you.
The thing is, I disagree with you not because I don't think you're right, but because I think that as far as the game context goes, the ME2 squadmates are in some cases pushed aside to make room for the return of the ME1 characters.
If this was the case, I'd have advocated for a completely new team in ME3.