Ok if Zombies (Romero type) really attacked...

[alien space marine]

Runners have that greater swarm effect , Shufflers as in the original DOTD couldnt keep both legs without one of the heroes smacking them down on their asses or down the escalator.

Shufflers have lossed their horror appeal because they are blantantly funny and horribly paraodied , Because you can just run right by them if your fast enough and smack them on the head, Endless your cornerd in by a pack of them unarmed otherwise shufflers are not as threatening as the runnin zombies.

The remake dawn of the dead compared to the original was alot more bleak, In the original you had outlaw bikers and red militias pretty holding their ground having a jolly good time wasting zombies, The zombies decimated the folks who didnt have a gun or didnt get with a posse.

In the remake it seemed like the main characters were the last remnant of humanity at one point.

Runin zombies dont think , Otherwise they could use elevators or guns or just open the freaking door, They just have this bloodlust to charge after the closest breathing human target displaying their ravenous nature rather then dumb ditz who will just bite you if you get to close.