Walking straight towards a target isn't pathfinding, PWR. Of course a zombie can find you, But they aren't going to be able to navigate obstacles MC style. A zombie (Undead, Not Voodoo) is just going to walk straight towards you without regard for obstacles or its own safety.
Let's take TWD zombies as an example. If they hear something, they can pretty much find the source, or the area of the source. If they smell meat, they can find the exact location of the meat, unless the meat is scent-masked with rotting mear. If they see something, they're going to follow it, even if the target goes around the corner. They're basically animals.
I mean, that's just one of many unique examples. In any example, though, they're all able to locate a target with some means of accuracy. Let alone magic zombies (i.e. necromantic thralls), which are basically rotting humans with bad reflexes. Zombies can hunt.
They're not braindead.
EDIT: Okay, so TECHNICALLY they're kind of braindead, but it's meant as a figure of speech... jeez...