Well the big selling point for this phones camera is the ultrapixel or whatever, a huge sensor (with low megapixels) so it can take amazing low light pictures.
I practically had the phone from day one, and the low light performance is SO BAD now that I thought my phone was broken after it started doing that, I was freaking out searching google and everything.
I just looked back in my phones gallery from pictures when I first got the phone to be sure, and yep, low light used to work before, they did something stupid to it at some point.