With the audience that Halo 4 was going for, I'm surprised this wasn't how the game worked on day 1.
This mod turns aim assist and bullet magnetism [b]way[/b] up for a ton of the guns; you don't need to aim anymore because the bullets hit if the enemy is on the screen and within range. If you use a gun like sniper or rockets, where there is already no bullet magnetism, the reticle will turn red from farther off, but you still need to directly hit them.
-
Clearly the guy that made the mod in the video doesn't know how to mod. If you are going to buff AA then do it like modders in Halo 2 did it.