I've always complained about so called "Zombie movies" that are actually just movies from any other genre with zombies. That's what this movie is: A shooter with zombies. Romero defined the Zombie genre, and he's now out of it. This was officially not a zombie movie.
There's been many attempts before. When-bugs-attack + zombies, teen flick + zombies, prom-night + zombies, etc,etc. Out of all those weird cross-gender movies, this is one of the best I've ever seen. It'll still get many negative reviews for a simple reason: People is judging it as a Romero movie, and at that, it sucks. And it's fair that people do that. They go to the movies expecting a Romero movie, and they get this. I would've been disappointed too if I'd expected that. I watched this sort of expecting a crappy movie, and I got a better-than-expected non-zombie flick. Not a bad deal.
The plot is certainly shallow, but the characters are still interesting, even if a little bit more empty than the usual lead roles from good old George A.
The deal is, there's nothing more to look for in Romero's movies. The social commentary is still there, except this time it doesn't really make sense. At a point, it looked like it was heading towards an anti- religious view of things (euthanasia), which looked interesting, but it dissipated into an old cheap western ending.
My theory:
George died at the end of the shooting of Land of the Dead, and both Diary and Survival where delivered but the Zombie of George Romero. Not bad (for a zombie).