I dunno, I thought in terms of pacing, directing, acting... just about everything, the remake of Dawn of the Dead improved on the original. I enjoyed the original, but I enjoyed the remake much more. In fact, it's probably my fav zombie movie of all time.
It's been awhile, but IIRC the opening of the original was kinda clunky. I remember not being able to make out the dialogue very well, and the speech from the black minister was mostly incomprehensible. The opening of the remake did a much better job of setting the scene and showing the outbreak of chaos in a much shorter time.
I was really disappointed with Land of the Dead. I never really liked the "intelligent zombie" idea, I think it kinda defeats the purpose of a zombie movie. I think the series really jumped the shark with this one.
My ranking would look more like this:
Dawn Remake > Return of the Living Dead > Dawn of the Dead > Night of the Living Dead > 28 Days Later