It's a FANTASTIC game, but...
Once you get to a certain point, there are just waaay to many people to handle. I'm no expert, but it seems that 30 zombies vs. one man is going to end badly for the man, even when he has huge guns to play with. I agree with what I have read so far...a great game, but some options aside from weapons would be nice. Mines, turrets, helpers, the option of manning your base for defense...use your obviously broad imagination.