Other games don't do it because they aren't Halo. Halo is innovative. Things like FP legs, more complex overlays (such as looking up/down) and multiple melee animations started (to what I can recall) in Halo 2. Same goes for the reticule placement, and I honestly think it was a great idea. It allows for a lower weapon origin that makes the gun look more like it's in your hands/against your shoulder (such as in Halo 3, which some of you may complain looked "stupid" but I honestly thought it looked great aesthetic-wise). It also allowed you to see more since the gun was lower and not covering so much of the screen.
Overall I just felt great paired along with Halo, and it's just another thing that makes Halo so unique among this slew of "Modern FPS games" these days.
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