I found it sort of boring, and the aiming of the game just made me cringe. Also, the melee weapons were destroyed by the terrible aiming system, they got nearly impossible to use when the zombies had any speed. Needs a lot of work.
Those Win Easily guides are Bogus. Get a Spread Machine gun, Two Decoys, a Damage buffer. I won every level like that, except for the last one, where I added a minigun.
I loved this game. It was worth it just for the ending song. But I think it could benefit from a lot more options in every avenue, just to make the game more expansive. I gave it a 5/5, but maybe for a second?
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