I'll probably be hated on for this, but:
Dawn of the Dead
Yeah, the original was influential. Yeah, there are some good moments. but:
1. It is still extremely cheesy. Maybe it's supposed to be part Horror, part Comedy, but there are better movies in that genre as well.
2. The blue make-up looks bad when compared to the effects we can do today. Like that apartment scene. I see that one black guy and think, "When did Richard Pryor drown?"
The remake is a pure blast. Not the greatest movie ever made, but still awesome. And don't even start crying to me about running zombies. There's a good chance that if your body chemistry has changed enough to make you and undead, cannibalistic corpse, then it could probably bypass rigor-mortis.