
I think some of the weapons could use more active animations.
I'm not expecting pixar here, but more "kick" or recoil on the shotgun and machine gun, for example, would be very useful. Perhaps it could even be enveloped as a numerical value for the weapons edit menu (which, by the way, is a BRILLIANT feature, THANK YOUTHANKYOUTHANKYOU)
Also, as I am sure you are aware, the muzzle flashes on the shotgun and machinegun are lacking.
Again, I don't expect or demand FEAR on this, but some better effects in this regard make the weapon FEEL more powerful and effective. It adds to the whole experience.
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At the very least make these features on par with quake three. You've done this with most of the weapons, not all of them. The laser-based weapons look rather good, for example.