1. Shaun of the Dead
It was a funny take on zombies which in no way robbed them of their underlying disturbing qualities.
2. Dead Alive
It took the zombie phenomenon to a completely (il)logical conclusion, and remained personable in that oddly-likeable early-Peter-Jackson-way. And it brought "returning to the womb" to a new disturbing extent, while redeeming the lawnmower as a zombie-fighting weapon.
3. Enter ... Zombie King!
Is it a zombie movie with luchadores, or a luchadore movie with zombies? Who cares?! It's ludicrously entertaining. Certainly the ne plus ultra of zombie/luchadore films.
4. House of the Dead II
It had everything that you want in a run-of-the-mill zombie movie, done well (if not too expensively). It had gore, but didn't fetishize the viscera. It had scary bits. Funny bits. Character development. It had your standard (cliched?) zombie downer ending without being nihilistic. I know nothing of the first (Uwe-Boll-directed) film, but I really enjoyed the sequel.
5. Zombie Lake
The classic (to my mind) Nazi Zombie film. French-produced, and with copious nudity. Also, a classic good-zombie-on-bad-zombie knife fight. A little girl telling an assembled group of villagers, "Bring me a bucket of blood."
Just missed: The Dead Next Door, I Was A Teenage Zombie.
#1 and #2 were not Smithee movies. #3, I cannot make up my mind. #4 will be a Smithee movie, and #5 is a classic Smithee movie.