Promotional material for the film claimed that it was "based on true events" experienced by the Snedeker family of Southington, Connecticut in 1986. Ed and Lorraine Warren claimed that the Snedeker house was a former funeral home where morticians committed necromancy and/or necrophilia with the corpses, and that there were "powerful" supernatural "forces at work" that were cured by an exorcism.
However, according to skeptical investigator Benjamin Radford, there is "little or no proof that anything supernatural occurred at the house". Radford wrote that author Ray Garton was employed by the Warrens to write the supposedly "true story" and was instructed by Ed Warren, "You've got some of the story — just use what works and make the rest up… Just make it up and make it scary."
Researcher Joe Nickell has dismissed the story as a hoax. Nickell noted that since Ed Warren died in 2006, some of his coauthors have admitted he "told them to make up incidents and details to create scary stories."
Moria concludes, "This is a film that in its constant and persistent need to keep producing effects for their own sake achieves zero effect whatsoever as a scare show." DVD Talk says, "The Haunting in Connecticut isn't unwatchable or anything, but it's almost aggressively forgettable...as stiff and lifeless as the dusty stacks of bodies from its old mortuary."
Roger Ebert calls it "technically proficient horror movie and well acted" but adds,
If the movie has a flaw, and it does, it's too many Surprises. Every door, window, bedroom, hallway, staircase, basement area, attic and crawlspace is packed with Surprises, so that it's a rare event in the house that takes place normally. The Campbells are constantly being Surprised, so often they must be tuckered out at day's end from all of that running, jumping and standing real still.Empire Online gives it 2 out of 5 stars and closes by calling it a "Fairly pedestrian haunted chiller with so many obvious shocks that they lose their efficacy." Rotten Tomatoes has a critics score of 16%.
But I must not be too harsh...