I think it's pretty much one of the best movies ever. It totally ranks high on the 'must re-watch over and over again' meter. Woody Harrelson had the BEST story plot ever. To find a fresh box of twinkies before they all expire. Also, there's a sequel. The writers actually announced it before the movie was released, though they said only if the box office was good enough, and this movie, BY FAR, will easily make it to a sequel. Something I found amusing was that both the writers have seen next to NO zombie movies at all. The one writer had only ever seen 1 zombie movie ever and was Shawn of the Dead, which makes sense, since Zombie Land is like Shawn of the Dead with American humor and set in America and was better. Not to say Shawn of the Dead wasn't good, because let me tell you h-wat, I love Shawn of the Dead, but seriously, Zombie Land was better.
Also:
Rule #18: Limber Up