Wolfman was one of the best houses I've experienced at HHN. Scares or not (I did this house at least a dozen times -- like many others, it was hit-or-miss based on the moment), the set decoration was SPECTACULAR.
Wolfman the movie, on the other hand........ one of the worst films in years.
As far as Harry Potter and HHN goes --- Halloween is a heavy theme element in Potter, so in my opinion I think it's a given that we will see a Potter Halloween event in the future (not this year). But definitely not as a part of HHN. Potter thematically uses traditional Halloween elements --- witches, black cats, pumpkins, cauldrons, etc. HHN, although they obviously use some of those classic elements, is more about the horror -- gore, blood, slashers, etc. There's actually a big difference between "horror" and classical Halloween as Potter incorporates.
Universal would be missing a huge opportunity if they didn't eventually create an after-hours Potter Halloween event, and I have to think it's probably been in their plans all along. But think Mickey's Not So Scary Halloween Party geared towards the young adult demographic, as opposed to HHN. Mickey's Not So Scary sells out consistently. Could you imagine the hit Disney would take if Universal brought Potter into that game?