i wasn't really bothered by if...'s limited ammo that much though personally.
guns start falling off at sloth, then you can get a better gun in envy so they're sorta ok again until greed.
but mostly i used them to charm enemies.
and once i get the sword from the old guy in envy/greed, i don't rely on guns much anymore.
i don't remember how good they were for akira's route. i should really replay his route.