Tell me why this is good?

Why was this ever recorded? A legacy for future generations or so? Of course, whatever’s made there will always be people that love it, but should that be a reason to make it? Should some afternoons of fun be recorded for a broader audience? Aren’t there enough dramatic clubs to fulfil their needs? Well, I don’t like it, that’s obvious, but I cannot in my right mind think of anyone who does. So much bad acting, so little storyline, so little tension, such bad dialogues, etc, I am really amazed, you have to meet some basic criteria while making a movie.
The people that obviously do like this movie cover their backs by comments like:
I figure about 98% of the average movie-going public would absolutely loath this film if they ever got to see it. Which is quite normal actually, because it isn't made for them. Watching The Dead Next Door is pretty useless, unless you're into this kind of gory and amateurish splatter fun.
I oppose to this kind of attitude, everyone has the right to view and judge a movie, ‘pretty useless’ is a non-defining qualification, if it’s bad then of course 98% won’t like it, well, tell me more. I like zombie/horror movies but I have seen them far better than this one. So can anyone tell us what’s good about this movie? I would like to know and don’t come to me with a “you like it or not”, that's about the simplest answer I can think of, give me facts.