Alien has two great movies, and then most people will pick one of the rest as a "good" movie although it will probably not be the same one for a lot of people. I thought Prometheus was "good." Alien 3 is "almost good."

Evil Dead has the first two and Army of Darkness (not scary but good), and I know some people really liked the remake. Honestly, Army of Darkness is the only one I've seen.

I enjoyed two of the paranormal activity movies in the theater (1 and 3), although I'd never watch them any other way. The second one was okay in a theater full of people but not quite good.

The Conjuring universe just needs to produce one more good movie to crack 3, imo.