Low budget for sure!!
But I would have to say its probably realistic as it would probably be in real life.
I think we get spoiled if a major studio isn't involved that will spend 100 million plus on a special effects full movie with big name actors!
This is a little film but I felt Like this could happen to my town and I would act the same way these people did!! Its not the best acting movie but I enjoyed it more than World War Z !. So I guess it makes me nuts,still look at the Night of the Living Dead, it was made for all most nothing and it had a no name cast and a very low budget and it still was a hit and fun to watch today . So give it a chance its slow in spots. As I said its probably how real people would do if this happened to a real small town!!