I have owned a lot of phones in the last couple years, including the OnePlus 2, and I would rank it between 10 and 14. I arrived at that because the camera is better than the Nexus 6, but not as good as the iPhone 6s in my opinion. I have owned the Moto X Style, LG G4, Nexus 6P, and Galaxy S6 and the OnePlus 2 camera is not as good as those in my experience.
edit: Oh crap. Just realized I wasted time responding to a banned user.