People hold Universal to a different standard, and that's why Disney gets thumbs down in the "step it up" department.
I will agree that WWoHP is amazing. The theming, the ride, the butterbeer ... all of it. I love that part of the park.
But it's the only part of the park I go to. I go in, go to WWoHP, spend a few hours, leave. And when you walk out of WWoHP into Seuss Landing, the first thing I think is, "Boy ... these buildings are faded!" The whole rest of the park looks like they've barely done any maintenance. But then ... no one expects them to. They have thrill rides! Harry Potter! Spiderman! No one gets upset if Seuss Landing looks faded or if they cut back entertainment to almost nothing or if the kids areas are still based on Feivel (who?) and Barney (eww). I'm not a "off the shelf thrill ride" person, so nothing else in either park really holds my interest. (Dr. Doom's Firefall? No thanks -- if I'm going to ride a drop ride, I'd MUCH rather have Tower of Terror. Men in Black? Nope. Give me Buzz or TSMM any day. Popeye vs. Splash? No contest.)
At Disney, people get mad when there's chipped paint, burned-out bulbs or dirty windows. They can't find the princess they want in the exact dress they want her to be in and letters and e-mails come pouring in. There are characters who have been on Disney Jr for a year and they're not in meet & greet form yet? How dare they!
No one remembers WWoHP's delays or the timeline or the problems it encountered during soft openings. No one talks about how outdated E.T., Twister or Beetlejuice are. No one talks about how lame the Disaster! attraction is or how you have to pay for FP or how annoying that walk from the parking garage to the parks is. How many people actually visit the rest of the park, other than to go from coaster to coaster? Who spends time exploring the theming of Superhero Island? When was the last time you were immersed in shops and entertainment in Amityville? When was the last time your kid begged you to let him wear his Woody Woodpecker costume to school?
Yes, they're both theme parks and, as such, are the "same" business. But the expectations of the guest are different. If they weren't, this thread wouldn't exist.