I thought it absolutely enjoyable in an entirely non-zombie way. I loved the movie as it was great fun, exciting action, and gore abounds, but, I do not consider it the type of super-personal 'zombie film' that I love so much.

In fact, for two excellent types of such super-personal films that predate the modern zombie film (1968,) look at Hitchcock's Lifeboat (1944) and Sidney Lumet's 12 Angry Men (1957, though he's best known for Serpico). Both include small groups of people completely reliant upon each other to make it (to a verdict, or to just survive.)

That said, I also absolutely love Robert Rodriguez and his style of "grab the camera, we're about to make a movie!"-filmmaking. I think he's able to relate his energy in a way that usually takes AAA directing (I'd categorize his style as one of 'potential' over 'polish,' but he's also capable of selling what he's doing to the viewer, two characteristics that work amazingly in tandem, at least for me.)

So, what did I think? In short, I absolutely loved it, but I didn't mention it because I don't think it fits in with what I love about zombies.