Truly we are entering the golden age of zombie movies. The zombies themselves, meh, but the story of the survivors grows to great, if gory, depths.
In flashbacks we learn how our hero* experienced the traumatic fall of civilization, crashing into a few loners striving against the hordes of remaining zombies**. The story arc here is fine (if a bit flawed), from loss to survival to quest to success to final price paid. The zombies are a little too animated and a little too smart, but the rest of the movie makes that forgivable.
Between this and 28 Days Later, I'm impressed by the depth of the genre, and how major hyper-active cities can be filmed as dead.
* - I'm noticing how some movies have characters worthy of the moniker "hero", while others merely have "protagonists".
** - Zombie movies never use the term "zombie" anymore.