The zombie flick has become lately as popular as the Western in the 1950's, so it made sense to bring the man who created it to exploit its popularity.
The deal is, “Land of the Dead” is a zombie flick alright, but not exactly a horror movie, as Romero's original “Night of the Living Dead”. “Land of the Dead” owes more those post- apocalyptic B-movies from the 70s and 80s -like “The Road Warrior”, “Escape from New York” and “The Omega Man”- than the zombie genre Romero created.
This doesn't mean the movie is not scary. It has its moments. But beneath its high production value it has kind of that campy B-movie feel (per example, the zombies have now a zombie leader, who most times is more funny than scary).
In this times of good zombie flicks like “28 Days Later”, the parody “Shaun of the Dead” and the terrific remake of Romero's “Dawn of the Dead” this movie is kind of redundant. It'll still a treat for a generation who misses the post apocalyptic movies from 25 years ago.