We attended on opening night (9/14) and while it was a good time overall it is not something I would attempt to experience again. We purposely scheduled our trip around the HHN dates to make sure we could experience it for the first time ever. Below are
spoilers from the event so read at your own risk.
Spoilers
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Crowds:
Obscenely crowded on opening night. We were in the Finnegan's holding area, and went straight to Stranger Things at 5:30pm and had to wait 2 hours. We had express passes but thought we could get in quickly being amongst the first to the line and then use the express pass a 2nd time since Stranger Things was #1 on our list but that backfired with just about everyone in the holding area rushing to ST. Word has it they sold over 40k tickets for the opening night, and I would guess half those people had express passes as we didn't have a single house that was shorter than 20 minutes even with Express Passes. Stranger Things with express passes was estimated at 45-60 minutes by the time we exited the house. We checked back at 12:30am and the estimate was still the same.
Houses:
For all houses (except for Patient Zero) the decorations were great, costumes were great, and overall sets were great. However, there's just no creativity in regards to how they try to "scare" people from house to house. It's all 100% jump scares, you go around a corner and someone/something pops out with a loud noise. This results in being startled a bit at the first house and desensitized by the 3rd/4th house. Admittedly, I am not the one that gets scared, the Mrs. is, but there are other ways to scare people than the one trick pony the houses offer up.
For Dead Exposure: Patient Zero - excessive use of strobe effects, and I do mean excessive. Also very annoying sound effects used in this house. The overall feel of it was extremely uncomfortable from a senses standpoint that I wasn't even paying attention to the scare actors.
All the houses focused on loud, banging, shrieking noises, and less on actual atmosphere that I feel loud thematic music provides. I was hoping for more music throughout the houses and the park and didn't get very much.
Scare Zones:
Aside from Vamp 85, these were a total letdown. Too many people, not enough scare actors, and almost no screaming. There was just a complete lack of atmosphere for the event outside the houses. Much of the fun for us is seeing people get scared unexpectedly as they traverse the park and there was almost none of that happening. There were a couple "haha" moments when people got surprised by a chainsaw wielding scare actor outside the scare zones, but those weren't enough to create a fun atmosphere around the park. I had heard and read so much about HHN and was excited, but the scare zones and really just everything outside the houses failed to meet my expectations (Knotts Scary Farm does a better job with park atmosphere).
Vamp 85 was awesome. The music blasting really set the mood, the singing and dancing was great and the total immersion of the zone really gave it a great vibe. I wish I would've just spent the whole evening here instead of walking to the other ends of the park.
Scare Actors:
Outside the Vamp 85 area, I don't think the scare actors were very into things this year. Maybe just being opening night and really warm had something to do with it. But we didn't see a lot of people really dedicated to actually getting people to jump or be scared. There also did not seem to be very many scare actors outside the houses. The scare zones felt mostly barren and empty, overall just disappointing.
Lines and Queues:
I'm okay waiting in lines. After reading countless blogs and forums I was definitely expecting them for my first HHN event. That's also why I went with the express pass and mentally prepared myself that my wait would be half of what the standby queue time was listed as. That being said, it felt like they definitely oversold express pass for the event. Additionally, some of the walks to the houses and even more so the walk after finishing a house were very long. I estimate that the Trick'r'treat house had a half mile walk from the exit back to the park. Multiple houses had similar long walks back to the park. Add to this the long lines, even with express pass, and the poor layout of the line queues and it just resulted in much more walking than necessary. I know complaining about walking seems silly but even in my wildest scenario I didn't expect that there would be quite as much walking leaving one house, getting back to the main area, and then going through the next queue.
For Slaughter Cinema and Dead Exposure, these 2 houses were side by side but to do both required about 1.5 miles of walking. I would rather wait in a longer queue and do 1 house and then immediately go into the next to reduce that walking by half. I get this isn't ideal for Universal (and maybe some park guests that don't want to do a particular house) so that's really just my own personal squabble.
Merchandise:
Like all merchandise at Universal Studios, everything was marked up 100-300% more than normal. There were some cool shirts and the souvenir drinking glasses were slick but nothing memorable or worth the prices. I personally have a lot of black t-shirts from various events over the years, I really wish people would make them in other colors for these kinds of events.
Overall:
Having frequented lesser haunted events throughout the years and always wanting to experience HHN either at Hollywood but preferably at Orlando I had high expectations. The set and costume design quality were top notch and obviously worthy of Universal (I can't think of anything that rivals their quality), but everything else was a lackluster experience. Aside from visual quality and themes of the houses, there's nothing that HHN 28 offered me that I haven't gotten from other scare events. The scare attempts are all the same, the overall park atmosphere was lacking, and the crowd level felt extreme even for a Disney parks veteran.
Maybe when my kids are old enough to want to experience the event I will give it another go, otherwise I can say I'm glad I've done it but wouldn't plan another trip for it. If I happen to take another trip during the HHN event season then I would likely give it another shot after learning more about the event this year. However, I wouldn't purposely schedule another trip for HHN like I did this time around.
Edit - adding below section:
Newbie Tips:
Express Pass on any moderately crowded night (probably every Friday-Sunday) is definitely a must unless you have the ability to go on multiple nights.
Stranger Things was the longest and will likely remain the most popular house all season long. If you can start in the park and have express pass, use the express pass here first and then speed along to the other houses while everyone else waits in the standard queue or comes in through the main gate. If you start at the main gate and have express pass, then I recommend starting elsewhere for the shorter initial queues and ending at Stranger Things.
If you don't have express pass, then all bets are off and you should just prioritize your top 5 houses and utilize the app for wait times.
Grab some pizza and/or drinks and hang out in the Vamp 85 area, it is really well done thematically and is nearby 4 houses so it makes for a good time. I regret not spending more time in this zone due to my desire to see the other areas.
Be friendly with your fellow park goers, one of the best memories from the event was the people we chatted with during our 2-hour wait for Stranger Things. They were part of the reason we didn't jump over the rail to switch into the Express lane after the first hour had passed.
My Nostalgic Final Thought:
Writing all this up and reflecting on the event makes me want to give it another go with the lessons learned... but on a cooler, less busy night.

It's something everyone should experience once!