For instance Gab did not get Marie back and well it was just kind of downhill for him afterwards
.
Honestly, I can believe Gabe's motivations for cursing God and giving into darkness even more than I could Mathias!
Think of it: He goes through a life of servitude to the Brotherhood of Light, doing good deed and being heroic. What does he get? Possessed by a dark lord (and by proxy, the damn devil of all beings) and forced to kill his wife and the girl he befriended.
So he manages to pick himself up and goes on to defeat 2 of the 3 the Lords of Shadow (something the Brotherhood either couldn't or wouldn't do themselves, one man did by himself), takes down
LUCIFER (I honestly can't stress this enough) who is the ultimate incarnation of evil, and frees hundreds of souls from eternal limbo. What does he get? Oh, sorry, you're wife never could actually come back from the dead and has ascended to heaven and can't even be my your side anymore.
So everything he had in his life is lost. But hark, the morally ambiguous vampire girl tells you of the eldritch abomination about to break into our world and complete obliterate it. He sacrifices his humanity in order to take down said Uber!Monster, killing the last person he had any attachment to in the process, and comes out victorious and saves the world AGAIN. What does he get? Hunted by the same Brotherhood who sent him on this whole crazy trek in the first place, and has his long lost son sent after him to kill him because "OMG VAMPIRE = EVULS!!".
Yeah, I'd be pretty damn pissed off at the Brotherhood and God myself if that's what my reward is for all my suffering and sacrifice in
BOTH their names.