I have watched two of these movies (Epic Movie and Disaster Movie) and I can say that I only smiled at one of the jokes in one of the movies. Just one. And I didn't even chuckle. A combined total of 173 minutes and I didn't laugh once. This is telling because I have a juvenile sense of humor and find the stupidest things funny.
The filmmakers have no finesse or skill. They throw as many absurd visuals and comments into their movies as they can in a desperate attempt at getting a laugh. Every minute is jammed packed with ineffectual jokes. This is what is insulting to me. Instead of taking the time to fine tune the absurdity of the situation, they simply heap one thing a top of another.