While I will admit that in 98% of the cases the right light cameras are probably working just fine, my issue is that when there is a problem with the camera there is little to no recourse, due to both the distance of time and the lack of a human to argue with if there was some extenuating factor. (I have seen lights with VERY short yellows; somewhere around 1 second, but less than 2 seconds.) There have been numerous news articles about shenanigans either at the private company running the cameras, or at the municipalities, doing such things as short-yellows to increase revenues.
Even worse, in my mind, are the "blocking the box" cameras. More than once I have been pausing before crossing the intersection, to insure that I will not get caught blocking the box by the change in the light, and then right when there is space on the other side and I am part way across the intersection someone turning right-on-red cuts me off, filling the space and leaving me in "the box." Since all the cameras do is take a still photo (you can see the flash), this would not be evident, and it would look like I was in the wrong, when there was really nothing which I could have done to prevent it. Fortunately, none of those times have been at camera intersections.