Hump...the firing reticle in Halo is ginormous...as are the hitboxes, anything inside that huge ass reticle is a hit. Whereas in games like Quake and CS it's pinpoint. Hell in Quake games a lot of people just use a dot.
Shadowrune ended up with all inaccurate spray and pray style weapons. Obviously with that styl of game it's going to be a lot closer.