MarkB
Legend
Plus, the zombies cannot take full round actions in 3.5E, either. I think they can only do partial actions. So, if you have a mobile foe, the zombies will be generally pretty pathetic against them - the mobile foe will be able to attack and then move and keep out of the range of the zombies. The zombies can move or attack, but not both. So, if the zombie has to do more than take a 5 foot step to get into melee range, they won't be able to attack.
Just a quick clarification on this: Zombies, like any creature limited to taking one action, can still make a Charge attack, though they can move only their speed before attacking. This is the zombie's go-to tactic if there isn't an enemy within easy reach.