The game's characters are nothing more than WWII avatars. They lack story, background, or motivations other than to kill zombies using sniper rifles. In this game, you can only play as a sniper. Any secondary weapons are limited by the amount of ammo that they carry. This is one of the limitations in the design. Yes, it might be part of the Sniper Elite series but its design forces players into this role once they have abandoned all the other elements of the Sniper Elite games is a design flaw.
I am horrible at sniping in every game out there. In this game, I struggle to get a head-shot. The choice to play the game as I see fit has been removed for me without good reason or suitable replacement.
The tone of the game is one of its strengths. As your group plays through the campaign maps you may admire the attention to detail which uses lighting, scenery, and sounds to create the creepy atmosphere.