I used the camera once on the first day, thought the image quality was horrid, and turned it off. While putting the Vive away, however, I noticed I never removed the blue film covering the camera lens. Obviously that had to be impacting things. How much, I don't know, as to this day I haven't enabled the camera again.
Nine times out of ten that I want to see the outside world, I only want to see my monitor. Or more accurately, see my desktop while in a VR program. Steam's default desktop view in the VR hub is useless to the point where it might as well not exist. Can't read shit, and the interface is laggy. Virtual Desktop is miles better, but that would necessitate leaving the VR program I'm in and as such is a non starter. That only leaves the act of actually looking at the monitor, and the camera isn't going to help there.
The one time out of ten where it might actually be useful, the silly restriction where you have to enable it outside of the headset at the desktop pretty much kills the point. If I have to take the headset off to enable the camera feature, I might as well just do whatever I was going to do with the headset off instead. By the time I end my VR session and am naturally at the desktop, whatever it was that I needed the camera for is long since forgotten and SteamVR promptly shut down.
So yeah, essentially a useless feature for me, but it costs next to nothing to implement, so why not.