The zombie purist in me recoils at the idea of the special zombies. The Tank, while frightening, is just silly. The same is true to a lesser extent with the other specials. The tongue guy is probably the second worst.

If they wanted to make some zombies tougher than others, they could've easily gone another way without heading into the mystical.

Have former riot police zombies in body armor, for example. Make them tough to take down.

...IMO.