First and foremost, fast zombies did not start in the 28 series. They started in Return of the Living Dead, when that director and Romero had their split in ideas of how to continue with zombies (they use to make movies together). They were also intelligent and unkillable. As much as I love Romero, Romero zombies are a joke. Slow shambling corpses aren't going to take over the world or overpower anyone or anything. If I can stand on top of a building, car, big rock, and kill thousands of zombies with a nail on a stick, that monster has failed at existence. More importantly, zombies who die by decapitation or "your head asplode" aren't going to do any human or animal ass kicking. While we're on it, what's this crap with zombies that only attack humans but no other mammals? Frankly, the thing that would scare the shat out of me is a zombie cat(s). They can be absolutely anywhere, and you won't see or hear them until they've already bitten or scratched you, which is too late.
I'm a fan of fast unkillable zombies, as seen on Return of the Living Dead. Now that's suspense, though, I can generally do without anything more than the most basic brain funcitons. Even 28 and Quarantine zombies would be scary, but only in the short term. That type of monster lacks the staying power to create the much loved zombie apocolypse genre. They're too fragile to overtake the world or slaughter humanity.
Best zombie joke ever comes from World War Z, where a super high tech American military unit loses to a horde of Romero zombies that must cross a long ass narrow bridge, despite tank and helicopter support and automatic weapons, but at the same time, a lone blind old man saves Japan with nothing but a stick while hiding in the woods and killing zombies from atop of big rocks... LAME!!!
