This show is already dragging, as most sci-fi serials tend to do (Enterprise, Atlantis, and most especially, Deep Space 9). The serial format doesn't work well with sci-fi. I stopped watching The Journeyman after episode 2 because it already started to become monotonous.
I agree with NIC about the android's sudden change of behavior -- from her human-like coy charm to her analytical, emotionless nature. Since meeting John was the first, and possibly most important, part of her mission, then I suppose she could have been programmed to shut off any redundant characteristics (like personality), after this milestone was accomplished.
Spock, Data, T'Paul, have shown that dispassionate reactions in traumatic situations can be amusing. A good example is when the cyborg got her face smashed into the car's windshield and she phlegmatically said to the occupants, "Please stay calm." I also like her detached practicality, like when she apathetically suggested that Sarah kill the cell phone salesperson, or when she told John to let the teen girl jump from the building. You want to love her and hate her at the same time.
The writers need to recompense the thrill-seeking action fans, but try too hard. Both cyborgs got hit by a car in the same five minutes in episode 2. They have full-spectrum vision but can't see a car coming? Of course, they didn't just get dinged by these cars; it had to be as graphic as possible so that the young male viewers will yell, "Wicked! Did you see that?" This show has barely managed to avoid the cheap shoot-'em-up endings, the outrun-the-explosions, the drive-the-big-truck-through-the-gate, the peel-my-skin-off-my-face-in-the mirror-for-no-good-reason, the you-shoot-at-me-100-times-and-miss-but-I-shoot-you-once-and-get-you-in-the-heart cheesy television action.
The girl cyborg is just another WB-style character, complete with Buffy-style butt kicking (I've seen enough roundhouse kicks, thanks), faces and heads getting shot off, impalements galore, and as much violence as Fox will allow.
John started as a whiner and he's now also a troublemaker. He has become the annoying Scrappy Doo, continuously being bailed out because he doesn't stay out of trouble. I almost wish he'd get shot. The writers seem to want him to grow into his role as a hero, showing his progress as he matures. Unfortunately, until then, we'll have to suffer from his laments about how he has to stay home while everyone else gets to play. How did he become a computer genius anyway? Using his laptop on the kitchen table?