Well this isnt DF

This game is waaaay different, and having any 50 agi zombies would be mass murder for any starter -level 10 Player(s)

zombies that wander aimlessly But when They Notice you They Sprint at you.Also It Should Be LIKE L4D When Any normal zombie gets A good Hit Dies.

Yup, JJBenson is right, this is kinda like combat in L4D, unless you attack or go close to a zombie they wont see or notice you, and most of the normal zombies dies from a good hit.

I don't fear fast or slow zombies, the only thing I fear is they will learn how to put on rollerblades. When zombies learn that, humanity is over.

when zombies learn, their not conventional zombies anymore

My opinion Stands.

I actually say both realistically as zombies who are fresh would run like 28 days later or dawn of the dead, but after they get older would slow down like the resident evil zombies.
Or they could be rabie zombies like Left 4 Dead in which case i sugest you run and dont get bit.