The lesson learned from Zombieland, a horror fest with comic elements, is that being phobic and anti-social might save you if the planet is ever stricken with a type of mad cow disease that infects humans.
On the other hand, the two writers and director (Ruben Fleischer) of Zombieland seem to have forgotten that that particular form of the undead has as much personality as a shark. See human, devour.
In fact, the shark in Jaws had more personality. So what was needed in Zombieland is something resembling, oh, a plot or an idea. But watching new ways to kill zombies and some guy with a Twinkie addiction (Woody Harrelson) is like eating a Twinkie — good for about one second and then just bad for you.
There is one funny conceit in the film, involving Bill Murray, but otherwise, Harrelson and Jesse Eisenberg, Abigail Breslin and Emma Stone as the other survivors are pretty wasted as characters who spend their lives wasting the grossly undead.