My wife and I, went to the scare-actor dining this past Saturday and we had a great time. We had official photos taken with Sam and the purge woman. At the end of the event they gave us a code to download the pics of Sam and purge woman for free.
Without a universal photographer there was a vampire from Vamp 85 walking around and the wicked witch from scary tales. The wicked witch talked to us, and was very entertaining. And the Vampire kept trying to sneak up to scare people at every table.
They had 2 characters not at the HHN event an evil doctor that was very funny and his assistant. They didn't come to our table, but we could have easily asked for either of them to stop over. The 4 characters that were part of HHN houses/scare zones all stopped at our table and interacted with us, though only the wicked witch talked.
We had a great time, and highly recommend it. We didn't have day passes, so we finished dinner by 6, and got a start on the houses before general admission was let in. The food was ok, but the character interactions and early access to houses made the event well worth it to us.
I was surprised there was no Demogorgon or Michael Myers, but we are big Trick R Treat fans, and were just happy to get a nice pic with Sam.