The robots' fighting skills in the final episode (or lack thereof)

These robots are supposed to be "military standard", being put into combat and fighting/shooting effectively.
How come they missed so many shots?
More to the point, why couldn't they coordinate their shots so that they all fired at once?
I mean, only a few shot at first, and then the humans were fleeing in terror. That's a horrible strategy.
And at the very end, why did they have to jump on the guy trying to blow everyone up, why not shoot him? A bullet travels a lot faster than a quarter-ton robot.

Communication.
They could clearly receive orders from the laptop that Daniel had, yet they had to use hand signals to "speak" to each other? And did they *really* have to put their fingers to their ears to simulate communicating with a headset? They obviously had wireless communication built in.

Lastly, shooting positions. Why would a sturdy metal construction need to kneel to shoot with a simple rifle? The recoil should be like a feather brushing against it.

I know I know, they were designed to be humanoid-looking, but it's no need to have them do stuff that is not necessary and takes a lot longer to execute than the most logical stuff.