Definitely not the first time a topic like this has been created (hell I made one a few years back I believe lol), but my list has changed since then, so I'll bite:
(Note: it's impossible for me to make an ordered top 25, as there's just too many great houses, and it's all subjective, depending on how I'm remembering a house currently. So, with the exception of a top 3, which are their greatest achievements imo, the list is ordered by year, not favorites.)
1. Nightmare on Elm Street (07)
2. Monsters and Mayhem (15)
3. An American Werewolf In London (13)
The Skool (05)
Screamhouse: Resurrection (06)
PsychoScareapy: Maximum Madness (06)
People Under the Stairs: Under Construction (06)
Scary Tales: Once Upon a Nightmare (08)
Dead Exposure (08)
Silver Screams (09)
Catacombs: Black Death Rising (10)
Hades: Gates of Ruins (10)
Orfange: Ashes to Ashes (10)
Winter's Night (11)
Nightingales: Blood Prey (11)
Nevermore: The Madness of Poe (11)
The In-Between (11)
Saws N Steam: Into the Machine (11)
Gothic (12)
Cabin in the Woods (13)
Evil Dead (13)
Dollhouse of the Damned (14)
Halloween (14)
Freddy vs Jason (15)
Body Collectors: Recollections (15)
Favorite years of HHN:
1a. 2011 (Strongest house lineup by FAR, great zones, and whole ton of fun.)
1b. 2015 (I had the most fun of any year this year due to many, maaany visits, great new friends, and an overall just awesome event. Only reason it's not solely my favorite year is that I feel the house lineup for 2011 was stronger. Had AWiL made it's first appearance this year, and TWD was not a thing, this would be the clear winner.)
3. 2006
4. 2010
5. 2013
6. 2009
7. 2007
8. 2014
9. 2008
10. 2005* (Only putting 05 this low as it was my first year, I was 9, and I don't really remember it at all.)
11. 2012 (A lot of the problems of 2012 were not A&D's fault, but it doesn't negate the fact that there were only 4 good-great houses[Gothic, Dead End, HoH, P&T], 2 bad houses [Alice Cooper and TWD], and one TERRIBLE house [fucking Silent Hill] imo. Couple that with the most unwatchable B&T of all time, lacking streets, down a house, and just an overall lack of HHN-esque presence, this year is the clear low point of HHN. All this considered, it was still fun, as it's HHN. It's always fun.)