Accuracy is most important in the smaller calibers that might be used for smaller targets or get more fun time at the range.
If I bought a .222 or .223 and couldn't stack a couple of five shot groups in a one inch bull from a hundred yards I'd be a little disappointed. Of course I'd expect a mistake out of myself more often than from the rifle.
From a more powerful rifle I'd be ok with 2 or 3 shot groups near an inch at 100 yards.
