Dear Agony-Aunt-Style Jackolytes,
I woke up this morning with a strange, evil thought in my mind... about importing one of my as-yet unused ME1
Sheps, romancing Miranda and then giving her the elbow at the last minute for Jack. Am I normal?
Yours,
Confused (and a bit silly this morning it seems) 
Seriously now, I think Jack's final romance scene feels like it needs a note or two more dialogue. I think Shepard's line about questions fits fairly well (harking back to Jack's
"You ask a lot of questions, don't you?" which starts the romance proper) but in a screenplay that's unfolded over how many hours of gameplay, a nod to the line to ensure the connection isn't missed by anyone wouldn't go amiss - when writing scripts, you have to pitch to the
whole crowd. In fact, I think his retort of
"You're the one that walked away" makes less sense because Jack never does once you reach that level of the wooing - she says she needs to think about it, which hardly constitutes walking away (unless Shep thought his mojo was so almighty she should have jumped his bones the second he came into the sub-basement). Shep never really buys her front, so it seems a pretty jackassy thing to say just to get a respose out (
"I know, ok? Maybe that wasn't right, but... I'm trying")... is the guy
trying to make her cry or something?

But I think it could be tweaked and used, I think, and not make him sound like a douchebag.
Some of the other love scenes are dialogue heavy, others are dialogue light; Jack's is the second shortest in duration (after Tali's) and has as little dialogue as that sport-f*ck you get out of Miranda, but it is, as is the case in almost every scene in the game, it's a question of timing. I don't think I'd want to change the dynamic of Jack's scene at all; its emphasis on physicality (and thus silence) I think is important - I really feel that it's what makes it the most traditionally-romantic moment in the whole game (cinematically speaking)...
So... let's give this a whirl... see if I can do this. Something that highlights Jack's vulnerability to the situation... time to wheel out "Proper Screenplay Mode"
INT - NORMANDY 2, SHEPARD'S QUARTERSShepard is reading from a datapad when Jack enters. Her voice is tinged with uncertainty.JACK: Shepard...
Shepard puts down the device and turns to face her.
SHEPARD: I wasn't expecting you, Jack.
JACK: I was thinking about you... where we're going... that we... we might not be coming back.
SHEPARD: We've never disguised the odds we're facing, Jack.
JACK: I screwed up, didn't I? Had to think about everything you kept asking me, and now we've got no time left. This is stupid... I shouldn't be here.
Jack turns to leave. Shepard takes hold of Jack's shoulder and turns her around to face him again. Her eyes glitter, on the verge of tears.SHEPARD: You were the one that wanted to wait.
JACK: I know, ok? Maybe that was wrong, but I'm trying... this is -
Shepard lifts Jack's face to his.SHEPARD: It
wasn't wrong, Jack. One last question... will you stay?
Jack pauses, hesitant for the briefest of moment, then allows herself to be true to her feelings. She melts into Shepards arms. Cue love scene, fade to black.