Physical: B
Mental: B
Experience: B
Emotional: F
Overall: Z+
And yes, Joe, there are multiple Mythos.
The Basics:
Romero - Unknown initial cause of zombieism. People who die turn. Disease accelerated through bites. Zombies are slow but can survive almost any attack. Conversion takes hours at least. Zombies are slow.
Late Romero - Same as above, only after significant periods of time zombies will be able to remember basic learned habits.
Romero Remake - Same as Romero, except fresh zombies retain all physical prowess for a while.
28 - Cause is RAGE virus. Zombies can starve to death. Zombies are fast mother fuckers. Conversion takes mere seconds. There is a rare genetic immunity to the disease. Any bite or scratch will transmit the disease.
Biohazard (Resident Evil) - Based on Romero. Zombieism is caused by a man-made viral weapon. There is a cure. Genetic mutations are prevalent. Various animals are affected by the virus (birds and dogs, specifically).
Biohazard 4 - Zombies caused are ancient parasitic lifeforms. They can be controlled by the hive master. There is a cure. Other Biohazard properties apply.
Return - Romero knock-offs. Similar, but lamer. Corpses can be reanimated, even if dead for centuries. No cure.
Solanum - From the "Zombie Survival Guide". Pretty generic zombies. Indefinite survival span. No cure.
Grindhouse - Zombieism caused by chemical weapon. No cure. (I don't know much about this kind).
Versus - Zombeism caused by evil forces. Any dead body instantly becomes a zombie. These zombies require MANY shots to the head before they are "killed". There is no cure.
There are WAY more kinds of zombies, too. So keep that in mind.
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Fixed