I tried twice.. and even on medium you stand like no chance... the zombie hoards are way to powerful and after your down to under fifteen people you're just screwed.
I havn't even played yet but after seeing the basic premis i'll say if you've ever seen "full metal alchemist" you'll see the story line of a boy fighting with a metal arm isn't exactly new... tried the first level before posting and the graphics are poor and gameplay is weak, because of these three things I'm not gonna play any more.