This is the rule for a HR as per the Commissioner: A home run should be categorized as a ball hit beyond the outfielders without them touching it.  If it’s a line drive that cleanly goes through (splits the outfielders), fine.  Takes a bad hop and cleanly misses an outfielder, fine.  But by no means should a home run be a ball that is dropped, kicked, deflected, thrown all around the field and it should also not involve a play at any base other than home.  If the outfielder tries to peg the guy at third and overthrows allowing him to score:  not a homer.