I Am Legend had vampires (they wern't living dead and they were harmed by sunlight)
The fast "zombies" in movies are always infected, not living dead therefore not zombies. Exception being to the remake of Dawn of the Dead movie (possibly? never saw it) But they are very creepy and can up a chase, they're the equivilent to a maniac cannibal really. However they're fuelled with rage and rarely work together. Plus they can starve to death and in 28DL they can be stopped like any other human, except they have a high pain threshold.
The slow zombies are more daunting, in very large numbers they're unstoppable but a single one is no threat. A reflection on soceity in Romero films. They can only be stopped by removing the head or destorying the brain. They solely rely on the core of their brain to keep them "alive".
So, the best movie zombie is..... *drum roll*
Bub, from Day of the Dead.
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