[thacounty]

I don't understand the "clicking noise" but it has a shutter sound. You can change the iso settings to iso 800 to make it take better pics.

Dust in screen is a problem that needs to be fixed. I don't have the issue but there are people who have pics posted of it.

Battery life for me is better than any smartphone I have used. I suggest making sure you don't have 100% issue. Definitely as Athlet1c said, root and get a better rom on it.

I think the sensor is pretty good, if you don't like, turn it off in settings and get a brightness widget for your homescreen that you can use.