This is How I look at US Orlando vs the rest of the universal parks across the world. Universal Studios orlando decided that they wanted to build a resort and on a resort if you have the same things in the same parks then what's the point of having different parks. They decided to not infiltrate the studios with huge coasters and lots of thrill rides and went and built a park specifically for that. IOA is for the big outdoor coasters, the fantastic atmosphere and the thrills. The studios is for the realism of locations, the place to experience the movies and the attractions all can enjoy (well mostly all). Again, I was confused with the inclusion of rockit. First, from a stand point of it looking out of place and from a thematic level. It just never made sense to me and always felt out of place. It basically ruined the "studio" aspect for me with all the screaming.
Meanwhile I love the placement of hulk and VC over at islands! I feel they really do fit into that park well and fall in line to what the park caters to, high thrills and loads of fun. I am all about preserving that element of each park and giving people more reason to go and visit each one. Epic seems to be a love child of both US and IOA where it does have so thrills but they are not as jarring. So, while universal orlando resort does off variety, I feel they should keep it within it's respective park(s)