The only zombie movies I have ever liked are satirical ones like Shaun of the Dead. Return of the Living Dead was hilarious, too, as was the first Re-Animator (the H.P. Lovecraft novella scared the hell out of me, though).
Zombies are cheap monsters, so their appeal is understandable, but they're too ridiculous to take seriously as a threat. For one thing, how does a rotting corpse chew up human flesh, much less digest it? Or walk, even? Vampires and werewolves may be played out but at least they're a tiny bit more plausible.