It was pretty fun, just buy the shotgun and rocket launcher, then use the rockets on the first level with the huge claw zombies. I just got 15k exp and bought the triple rockets along with the perks for the rocket launcher and the rest of the game was easy. I'd give it a solid 5/5. It just needs a sequel in which survivors do something useful like in the last stand.
Im with draven ive been trying to finish chalenge 4 for about an hour now, htf are u supposed to win? the darn thing ignores the sheild and murders the sword in 5 shots wtf is up with this
 "Little Wheel"){kind=icon}
 "Endless Zombie Rampage 2"){kind=icon}
 "Bot Arena 3"){kind=icon}
 "Micro Olympics"){kind=icon}