Summary: Got it for the steam Halloween sale for 2.50, and deleted it after 8 hours. As stated in the other reviews its not bad, but its not good either. I just got bored with it, and realistically I have so many other games Id rather play I'm never going to touch this one again. Which says alot because I love zombies, AND twin stick shooters.
Summary: As (at the time of writing) the only other user reviewer has said - save your money. Shinigurai's review is exactly what I came here to write. The levelling up system is insipid, the quests are repetitive and boring, and the plot is a downright snoozefest. If you completely love twin stick shooters and zombies, and are willing to overlook poor game mechanics, then you might enjoy it. As (at the time of writing) the only other user reviewer has said - save your money.
Summary: Save your money. All Zombies Must Die isn't a BAD game, it simply isn't a good one either. As many reviewers have said, it is very repetitive and offers minimal plot development. You can level characters and increase their stats, but the increases are almost indiscernible. The crafting system is a joke with a handful of base weapons and 6 elemental upgrades which are the same for each Save your money.
Summary: Loved this game! not sure what all the fuss about no online is... I have mates who I see in person so it all makes sense to me :P Had a few of the boys round and we haven't laughed so much in ages! Spent most of the time killing each other rather then the zombies, but eventually got to killing them too.