I saw it today. I personally thought it was amazing up until the end. I thought the end was genuine shit. It could not have been more generic. I was actually honestly hoping that 'Anna' would like drop the vaccine on accident right as she walked into that refugee camp.
But don't get me wrong, I absolutely wholeheartedly enjoyed the rest of the movie. And I shed a single tear when Sam died edumacate;
Yeah I see where you are coming from. It ends all happy, YAY HUMANITY LIVES ON! Uhg. I wish that refugee camp didn't exist and they made a sequel in which she has to repopulate the world. (If you know what I mean) ;)