Aliens claws slashing, jaws biting, big tyrant limbs swinging, touching basilisk hands... LOVELY!
Also reduces the time that newbies are spending on realizing that aliens have to aim their attacks too.
Same +1 for reloading. it's nice to be in 'full contact' with your instruments.
+ANIMATION i would recommend is the left handed blasting, so your primary weapon would not be hidden anymore when you are running with a blaster around. just make the character a cool position, cigarette in the mouth, holding the primary weapon like a katana in it's scabbard or a leather jacket on the shoulder, and with the other hand it could aim down the low HP tyrants.