Well, the 6.5 CM didn't hang the moon, cure the common cold, & it doesn't take in wayward puppies. But it does make the trip to a thousand yards better than the 308, & does it with less recoil, one of it's missions when first devised. Mission accomplished.
Otherwise, likes been said, it'll kill a deer about the same as 40 other cartridges. But really, cartridges don't kill deer, bullets do. Popular saying lately; bullets count way more than headstamps. :mrgreen:
Good medium to long range trajectory & wind bucking ability matters to some folks too.