I know I'm gonna get my head bitten off for this one, but I thought in the realm of zombie parody, Zombieland was much more to my tastes than Shaun of the Dead. Don't get me wrong, SotD was frickin' kick ass, but they did some things that put me in the awkward chair too often.
One was that they had at least three "touching" moments that were completely opposite to what the film was trying to accomplish. It's like reading a web comic that is known for it's slap-stick and wackiness, and then, one week, the throw in a comic where the main character's friend dies of aids or something. It's awkward and you feel bad about yourself which is exactly not what I wanted to feel while reading it. Zombieland did have a "touching" moment, but it was short and immediately ended with an appropriate joke so everyone is feeling just fine.
It kept things funny. All fun all the time. Pretty much any way you could have fun in a zombie apocalypse and no touching moments, serious tension, explanations of what's happening, or anything else to break up the fun. That's why I loved Zombieland.