Coma would have required a different incident, though. What happened to Shepard at the beginning pretty much necessitated resurrection from death. Now, if you want to rewrite the whole beginning sequence then fair enough, but I personally would want to keep it. My jaw was on the floor when the Normandy was exploding around me, when a section was exposed to space and debris was floating around, when Shepard gets knocked away from the escape pod and floats off into space. It's one of the best openings I've seen for a game.
Er, why? TIM turns out to be justified since Shepard always agrees to help him. And Shepard is the type of guy who'd do what it takes to help people and/or kill the Collectors right? Not to mention you have the dialogue option to say you don't believe TIM, to which he responds go to Freedom's progress and check it out, then decide. Sounds fair to me.
I personally really liked several of those lines. Garrus' line in particular made me laugh.
There's very little discussion with TIM. I'm not arguing that Shepard chooses to work with him, everybody else was sitting on their asses. The execution is just a bit too rough. Shepard starts working with cerberus before talking to Anderson, to the council or his former squadmates. You can go to the citadel before going to omega, but you aren't given the chance to explain yourself and defend your cause to Anderson. I would have liked to call him for the council's and alliance's inaction, which caused Shepard's alliance with Cerberus in the first place. Insted, everyone talks about Shepard's "betrayal".
I agree about the starting sequence, I liked that scene too.
The main reason I didn't like the one liners (except for the "brought me back phrase", I loathed that one from the beginning for some reason) is that they're the only thing Shepard says about his death. Nobody has been reconstructed before in the ME universe, for all we know. Yet nobody cares. No one asks about how Shepard feels, no one is surprised. I understand the public doing so, after all Shepard was pretty much a legend and he could have pretended to be dead to go rogue, for all they know. But what about Shepard's squadmates? And Shepard himself? It was brushed off too quickly.
EDIT: Hm. Shepard could have turned on TIM when he was no longer useful, namely when he got enough trusted squadmates at his back and the collectors had been defeated. Which is what happens if you go Paragon at the end of ME2. The ship was also full of bugs and it had EDI. TIM probably didn't expect Miranda and EDI to help Shepard, provided they even survived the suicide mission. So TIM had good reasons to believe Shepard wouldn't turn on him while they were both useful for each other (ie the entire course of ME2). Thinking about it, TIM's plan isn't unreasonable.