I like my zombies on the slow side. I can't deal with those quick-moving "rage" zombies.
Yeah if one is a stickler for Zombie lore "Rage" Zombies (A.K.A. Boyle Zombies as in Danny Boyle 28 Days/Weeks Later) aren't really Zombies. They are classified as "infected".
They don't "die" and come back to life like traditional "Romero Zombies" (Night of the Living Dead, Dawn of the Dead, Day of the Dead, Land of the Dead, etc.)
But both are terrifying and "Rage" Zombies are actually a viable threat. We are already seeing attacks of "Bath Salt/Rage Zombies" in several States in the USA. Fortunately these "Bath Salt" Zombies can't pass on their affliction by biting. But some whack job engineering a super rabies virus that can be passed by bite or scratch is a very real threat.
I love zombie movies too but the high speed ones do stretch my use of Coleridge’s suspension of disbelief. Only fresh zombies could produce such speed but only in a very limited burst. Older high speed zombies would run out of their skin and muscles and fall apart.