is the range, one of the things I think 343 did very good was the effective range of the 3 main headshot weapon, BR looks to be most usueful of the 3 Because BR is a burst weapon, so, getting that head shot on a unshielded opponent is easier than a single shot weapon.
I might prove this myself tonight and come back tomorow, because I feel that the pistol have a recoil that give a disadvantage against the BR.
Regarding the topic, if this is an issue that is not intended, then 343 need to fix it, but IMO, the aim slowdown have no real impact on a performance level in the game, in other words, fixing this will not Improve your game dramatically, I have a couple of friends that are about to reach Champion as they play at the highest possible level when it comes to Halo, and they havent notice this, and when you play at this level is when you start noticing every little detail that can affect your aim.