I don't find them scary, jumpy at times yes... But I kinda laugh at the horror aspects of films.
And yes, The third one is set in the 80's when the girls were little and explains what happened earlier on in their lives. Thought it was kinda obvious so didn't really think I'd need to post it because I thought you'd have known
And yes, the third was controversial because the majority of the trailer wasn't actually put into the film which only added more variety if you ask me...