I'm skewed with Nazi Zombie Army. One on hand the X-Ray cameras of a bullet tearing up potential rotten lungs and exploding a Zombie's testes is indeed hilarious, but some of the most dull level design (as they're all ripped from Sniper Elite V2) and piss poor gameplay really make me just love to pick problems with the game.
You do get access to all the DLC weapons from Sniper Elite V2, which is lovely, but you'll soon realise that 90% of the guns are bloody useless as bolt action rifles aren't particularly effecient when 40 zombies are marching up the staircase to see what the taste of human brain is actually like. And the boss fights, good god they are terrible. If you're not endlessly spamming bullets in to an 8 foot zombie with a Machine Gun that can down all 4 of you in a minute you're fighting a 30 foot ghost who you damage by shooting incredibly fast moving skulls. Sound fun? No it bloody isn't.
I haven't even mentioned the screaming suicide Zombies who run straight up to you in an attempt to blow themselves up. Hilarious as it might be, the typical AI quirks the zombies show like being unable to walk in a straight line because of pathing issues make this INCREDIBLY frustrating when something moving at 50 miles an hour that can instantly kill you can't be easily dispatched because he doesn't know which side of the pavement looks prettier.
Unless you are the BIGGEST Sniper Elite fan or you're just hopelessly drunk and want to see rotting lungs be punctured for hours on end, I really can't recommend this wholeheartedly.