I went to the Halloween thing at Six Flags New England like 4 or 5 years ago and thought it was a ton of fun, LOVED the "house/maze" through the woods. It was so cool to be back in the woods, no conga line, wide enough for you to take your time and check stuff out and not hold everybody up, and then they had a pretty long tunnel type thing (archway like an aircraft hanger) that was pretty long with fog so think you couldn't see your hand in front of your face with some bright light flashes and lasers. It was a long walkthrough and the tunnel was so disorienting (in a fun way). The price was great too.
The Headless Horseman Haunted Hayride in NY was OK, the hayride was great...the corn maze was decent...the houses were lacking. The chainsaw carvers was an interesting touch. That might be a bit harsh, but I'm basing those ratings on the price and how crowded it was. If it was cheaper and/or less lines I'd give it more of a break. Waiting in the switchback lines for 90min for the hayride was a bit too much. I went to that like 4 or 5 different years. Of course, HHN has me so spoiled that I completely understand why the locals think it's the greatest thing in the world