It's been said by Romero that he has always had a soft spot for the zombies, since they really don't know what they're doing any more than any other feral carnivore, and it really shows in this film. There is a certain pathos exhibited here. Despite that they are essentially dead (as humans), and that they have no need or conceivable use for any material possessions, the zombies wander the mall due to the phantom wisps of memory that they still possess. It's almost a despondent attempt at remembering and reliving what is long gone and forever out of reach for them.
In addition, there is social commentary running through the zombies' patronization of the mall: we need many of those products mindlessly plucked from the shelves scarcely more than they do...just a thought...
Anyway, I especially liked the partial decapitation of the zombie at the airfield, I liked the general mall-seizing idea, and the whole apartment complex part, as well as most of the rest of the movie. I disliked the way some of the characters acted at times, and thought that the paramilitary biker gang was kinda corny (what kind of motivation did they have for doing what they did? I mean, really? Are they going to sell those items they stole to some zombie who killed the owner of a pawn shop or something?), but that's okay. Can't be perfect, now can we?
Anyway, this one's a must-see, and that's that.