I blame the exceptional expectations of fanboys who prefer to hold on to previous memories than accept what they have. Especially when they don't consider everything that goes into the event and the history of the event itself.
For starters, a lesson on the structure of Universal's departments:
Universal Creative - Develops attractions, rides, and areas of the theme parks. These are permanent installs. They have NOTHING TO DO WITH HORROR NIGHTS.
Entertainment - This is umbrella term that includes Events, Art & Design, Tech, Performers, etc. Within the context of this department, Art & Design are the ones who write scripts, design sets and costumes, and direct all live-shows within the park. Predominately, they're focus is on short-term stuff; things that are seasonal or have an inevitable end (though that may be open ended, like SuperStar). Art & Design are the ones who design and "create" HHN, parades, Grinchmas, etc.
Marketing - They develop and manage the advertising efforts for everything in the park. That includes hotels, attractions, and events.
Now, when "Roddy ran the event," it was actually TJ and Timon (can't remember his first name) in charge of Entertainment. Roddy was a key person in Art and Design, and also TJ's protégé. Mike was Roddy's protégé. That chain is important to remember. Here's another tidbit: Screamhouse in 2002 (which established the standard for quality through the aughts) was developed mostly by TJ. Not Roddy. In fact, Roddy never made an appearance at the rehearsals for that house. It was all TJ.
Roddy gets a lot of credit for the event during that time period because he was the face of the event. But it was TJ who allowed a good bit of bleed-over in who did what. A&D was able to establish their own marketing strategies because TJ allowed it. The augmented reality aspect of Terra Cruentes happened because TJ allowed it. All that was allowed because the park had nothing else to hang their hat on. To say "Roddy Roddy Roddy" ignores the contributions of Kim and Mike and Kenny and Lora and countless others we never hear about.
Roddy "created" Jack. Who was basically Pennywise. When he went to Busch Gardens, he created Trickster. Roddy is a super-creative guy.
Now, when Roddy was (justifiably) let go, his protégé of a decade shifted over into the lead position in A&D. Oh, and Comcast bought their parent company, which changed the overall philosophy of the park. Harry Potter happened, meaning HHN wasn't the only reason to go to Universal anymore. Most important though, other people got fired or left for better opportunities. People got promoted, changing their responsibilities. New people came in. With new people, new talents and ideas and opportunities popped up. That's what happens in a business. New blood brings new things. People like Patrick and Blake, who are actually the ones running HHN now. Because Mike is Creative Director of Entertainment. All of it. He doesn't have time to select every song. Just like Roddy didn't have time to select every song.
This is also ignoring the fact that the AUDIENCE has changed. Horror isn't a niche anymore. It's a big business with big IPs people want to experience that only Universal can do right. There's also more people attending, which requires unique solutions to protect performers. Like stages.
I have a lot of problems with the way HHN is RUN. Operational stuff. Performer management. Planning and communication. My issues with the event have nothing to with the product. My annoyances are things guests never see, because the product remains luxury-class. If a guest has issues with the product, actual specific issues with the product as purchased, then stop buying it. Because the changes were inevitable. To attempt to cast blame on anyone person or moment is naïve.