The Billion Health Zombies Are Not Fun

Some zombies seem to spawn with quadruple the health of normal zombies, which only makes it tedious when dealing with them. If you want a zombie with that much health, make it a different type of zombie that's easily distinguishable, instead of just skinning it as a regular zombie. It would at least make it more interesting, but it would still be extremely tedious and un-fun to deal with.