Post-Mass-Effect-3 blah blah

Spoilers.

First of all, they didn't half-ass it. The plot is still exactly the same, so if you didn't like the Starchild you're SOL. But assuming you didn't mind that, then your complaint was probably that not enough of the ending was fleshed out.

Rest assured that's been taken care of. As far as I can tell all your squadmates plus Hackett and Joker have new lines (although since Joker's first new lines are garbled static, I briefly assumed that they'd done what they did back in "Arrival" again, and just splatter static over stuff Seth Green had already recorded, but there is some new dialogue later on). Basically the new material explains 1) how your squadmates got off Earth (apparently somebody really upgraded the Normandy's stealth drive), 2) why Joker was running away at the end, and 3) what happened after the end.

So here's some random confessions. During my first playthrough (of the original ending), when I got to the part where Harbinger was beam-spamming me (but before I got all extra crispy), I was thinking "this is completely unrealistic." Given what that scene looks like now, with the Normandy coming in out of nowhere to pick up your squadmates and then bugger off again as opposed to, say, picking you up and launching you straight at the beam, all I can say to my past self is "you ain't seen nothing yet."

However, if I'm going to nitpick, the thing I'm going to nitpick about is the fact that we still have no idea how the hell Anderson followed Shepard up the beam. If he was that close behind, wouldn't Shepard have seen him? Also, from the dialogue, it sounds like he beat Shepard to-

Eh, let's be realistic here. Given the existing framework of the story, these extra scenes do their job of explaining what happened to everyone else. And that was the problem they could fix. So they fixed it.

As Wrex says if you destroyed Maelon's data in 2 and then warned him about the sabotage in 3, "apology accepted, Shepard."

There is one new option, interestingly. Shepard can decide that all three options suck and not pick any. This results in the Reapers completing the present cycle, followed by a different Stargazer tag.

As a sidebar, I was secretly hoping for another Battlestar Galactica reference. Pick the Synthesis ending, and you get a monologue from EDI that starts and ends with "I am alive." So there's that.