(Other stuff about the trial)
Actually I was thinking months after the verdict.
Verdict? What verdict?
Do you realize how many versions of the trial would have to be written? What about Shepard's Attorney? Shepard has the right to an attorney and would be an absolute idiot not to have one. Or do you want Shepard to carry the idiot ball again? In a Court Martial it is up to the prosecution to prove that the defendant, in this case Shepard, is guilty beyond a reasonable doubt - I'll assume they'd model this after the US and Canadian militaries. So who is going to testify? The mechanics would be very clumsy even if it did get to trial. Shepard would be sitting next to his/her attorney while his/her attorney asked questions or made objections, and made opening and closing arguments. Shepard wouldn't say anything. Unless Shepard represented his/herself which would be carrying the idiot ball. Also, unlike you see on television, the defense attorney does not put the defendant on the stand when they're winning.
Meanwhile the Batarians are being turned into cannibals so I doubt the Hegemony sent anyone to represent their side.
Trials also don't happen overnight. The defense team has to have time to prepare a defense. This means that the start of any trial could drag on for months. Shepard could be confined to base, and would probably be enjoying the facility's golf course while awaiting trial. He/she wouldn't be confined to a room especially not with the flimsy evidence being presented. Shepard would be pretty steamed at Anderson for bringing him/her in by stabbing them with the needle in that bar, however - something that Walters wrote happened in the Dark Horse comics and then white washed it in ME3.
Okay, so you have to subpoena Shepard's team: Garrus, Miranda, Tali, the entire team. But wait. Garrus is on Palaven. Grunt is on Tuchanka. Tali is with the Migrant Fleet. Samara is who knows where? Liara wasn't involved in the Cerberus stuff. Miranda and Jacob and Jack? Sure you can subpoena them. Now the prosecution has to get them to testify against Shepard regarding the Cerberus Base IF and only if Shepard turned over the base to Cerberus. Regarding the Bahak System? I guess that's going to be Hackett and the Batarians. Hackett wasn't there. None of those mercenaries that were on that asteroid are anywhere to be found. Shepard wasn't caught or killed. The Batarians might have some video of Shepard busting Kenson out of a prison. Kenson was a friend of Hackett's so Shepard won't be charged with that. But like I said the Batarians are being processed. And there's absolutely no evidence that Shepard blew up the relay even if he/she did.
So, like I said, what verdict? What trial? There's not sufficient evidence to bring Shepard to trial unless Shepard confesses. If Shepard doesn't sign a confession there's nothing that can be done. Too bad. It's over. Done. If they wanted a trial they did bad writing to set it up. And it would take even worse writing to pull it off.
But aside from this, from a plot standpoint, ME3 was far and away the best of the three. It's just that it had such a poor setup from ME2, which happened to be probably the most fun of the series even though it had no plot to speak of. I think the fact that the game play was so dramatically better than ME1 had a lot to do with its reception.
They should have simply written out the arrest and trial after they didn't hear anything from the Batarians, and just made canon that Shepard went back to the Alliance after ME2. The beginning scene up even through the defense committee was well done. The defense committee could have been better written giving Shepard his/her mission. They knew what they were up against, especially once they lost contact with Arcturus. They shouldn't have been a bunch of idiots.
Priority Earth could have been better done, too. And so could the ending. --- and this is why we're in Andromeda.