Who says anyone is "spraying and praying" all over? One shot is one shot, and neither the bullet nor the game animal cares what mechanism cycles the next round into the chamber. Lots of people (myself included) hunt with semiautos, not out of some crazy "must shoot everything in sight" urge, or a need to make up for poor shooting skills, but rather just because we already have one, it works fine, and there's no sense buying another rifle just to hunt.
The AR-10/AR-15 family is actually quite well-suited to hunting use (provided appropriate ammunition is used for the desired game), if you put aside asinine drivel about "spraying lead everywhere". Here's why:
Synthetic stocks are less susceptible to warping due to humidity and temperature changes.
Adjustable stocks (as commonly found on these rifles) make them usable by a wide range of ages and body types. My 6'3" friend and his 5'1" wife can easily use the same rifle to hunt, despite the large disparity in size.
The gas operation and large buffer tube reduce felt recoil, making it more comfortable for small or new shooters.
The placement and operation of the safety mean that it can be operated easily while already sighted on a target, unlike many bolt-action rifles where the safety is high on the receiver, or even on the back of the bolt. The safety can also be left engaged while loading and unloading, helping reduce the chances of accidental firing.
The detachable magazine makes loading and unloading much easier and reduces the chance of dropping cartridges while fumbling with the floorplate of a fixed magazine, or repeatedly cycling rounds through the action. Not only does this improve safety during these evolutions, but people are also more likely to follow safety rules like unloading when crossing ditches or fences, or climing into/out of tree stands.