Honestly the only reticle i really don't like is the hm401 one, it cluters middle so much that makes following a target while firing difficult, or even locking onto the zeds head is a bit slower for me because of that cross.
Shotgun one makes sense tbh, as it shows the general area where pellets will fly (actually makes easier to shoot down crawlers when they are under your feet while you retreat)
SMG one is fine... probably would fit rifle more as well.