Buckshot is fine as long as you pattern your gun and keep shots within 40 yards or so...I've killed dozens of deer with it...
The problem comes in when a hunter takes a shot that is too far and hasn't tried different loads and chokes so he really doesn't know how they pattern...Just like the guys that go hunting with a rifle that isn't sighted in for the round they are hunting with...
Know your weapon, know it's limitations and have restraint when the game is further away than you should be shooting at and you'll be fine...