It's interesting how some have such delightful experiences at Universal and others dont, and same for Disney. I've always felt like Uni was a bit lesser - still fun, but in small doses and definitely not as magical. I tend to think the cast members are not as friendly, that the guests are less happy, crowds are more chaotic, cleanliness isn't as good. Now, that's all anecdotal, but WHY do I feel that way about Uni and not Disney?
I think it has to do with the general level of interest and affinity. Arguably, both Disney and Universal both offer a similar kind of experience - themed and immersive entertainment, and both generally provide a high quality product with generally great service. They also are prone to the same pitfalls - overanxious crowds, cleanliness issues, high pricing, mediocre food/hotel rooms, the occasional rude CM. It happens - all of it, at both Dis and Uni. However, if one has a very high love for one, then they are generally willing to overlook the flaws. You don't "see" them because they aren't dragging down your experience enough to matter. When you go into Uni with the idea that it isn't as good, then it won't be as good and the flaws will outweigh the positives.
A good example of this lies in movies. Take DC and Marvel - both make superhero movies that are all essentially a cut & paste story, especially the origins. Both target a PG-13 rating. Both have interconnected universes. Now, I LOVE the MCU and generally like all of their movies, yet I can't stand DC movies even though I do like the characters and superheroes in general. I will harshly criticise DC movies for being too overwrought, or having ugly costumes, changed too much from the comics, or being unrealistic in certain aspects. Yet, the MCU will sometimes do the same things, and I will absolutely give them a pass on it. "Well, they're not trying to be realistic," I might say. "DC movies are too dark," and yet most of the ones not directed by Zach Snyder are not - but I still don't like them. It's just that DC struck a bad tone with me early on so I will hyperanalyze their flaws while lauding Marvel for the same. This could also apply to Star Wars - Originals versus Prequels versus Sequels - they are actually all fundamentally the same.
So, fans have this way of picking sides. Disney vs. Universal, Star Wars vs. Star Trek, Nintendo vs. Sega (or Sony, or Microsoft). Really, all that stuff is fundamentally the same thing, or so similar as to not matter on paper. It's this intangible aspect, this level of affinity that cuases us to see differences, even when they aren't really there. I still prefer my Disney experience over Universal. A friend of mine who is just a very casual theme parks visitor, thinks that they're pretty much the same - he said so on our recent trip. To me, to the fans, they are definitely not, but it's my friend who is actually probably right.