All that buildup for such a letdown of an ending [SPOILERS]
All through out the movie, Kramer teases the fact that he has this special game for Cecilia unlike the ones made for any of the other captives. We then find out it's just a gas chamber where you just have to fight to the death for the window of oxygen.....really? And she just walks free and potentially starts another scheme comfortably knowing Kramer would be dead in a few months anyway?
Another part that I absolutely hated was what was done with the stolen money. We see how passionate Kramer was with how Cecilia robbed so many naive patients and the families who lost them in her scam. They go out of their way to show these families and the amounts paid. So what does he do with the money? Not give it to said families but instead a little Mexican boy who has no aspirations whatsoever than kicking a ball against a building. One could argue that maybe his father (who was shown in all of 5 seconds) could use the money for the both of them but the movie does nothing to denote that either are deserving of it in any way. Maybe giving us a little backstory could've helped but I'm still in the camp of actually returning the money to the families as it was only the right thing to do.