Alright, so just watched the end of Torchwood: Miracle Day and there is pretty much one phrase that sums up my feelings:
What the fuck.
JACK HARKNESS IS SPECIAL! He's the only one that should have immortality because he's "a fixed point in time," not Rex! Dammit! I'm (mostly) glad Jack didn't die but to have Rex be immortal too, which I was afraid from the moment they revealed the transfusion, I knew this would happen. W. T. F.
Now I'm pissed.
ETA: I'll have a better post on this by Sunday, of the whole season, so stand by for more. ;)