I watched Haunting and attempted to watch Horseman- it was NOT good! Haunting was okay, but when they said "based on a true story" that was a VERY loose interpretation! I looked up info about the actual story and the only seemingly real correlations were that the house used to be a funeral home and that there were occasional seances held. There was no kid with cancer, no alcoholic dad and apparently the real family's stories were questioned about their authenticity because nobody's stories were very similar.
Anyway, I LOVE movies about hauntings and supernatural stuff, so it was right up my alley.