I guarantee I am one of the biggest Marvel and MCU fans on this forum and have spent an inordinate amount of time reading the comics and watching the films and TV series. The GotG IP slapped on the new EPCOT ride holds no appeal to me for several reasons. Unlike the California reskin, CR is a bad Guardians attraction. The main characters only appear on TV screens (and a TV screen size hologram in an empty room), the aesthetic is not recognizably Guardians, and the storyline breaks the MCU in comical fashion.
But even were CR a strong use of the Guardians IP (like, yes, Mission: Breakout), the allure of the IP is minimal. Because films (and comics) are a completely different type of media then theme parks and work in completely different ways. IPs don't translate directly. I adore Cars Land. I don't like the Cars films. I love the Harry Potter lands. I think the Potter films and books are fine. I prefer Universal to WDW now. I have almost no emotional attachment to any Universal IP outside of the classic monsters (which aren't really represented in the parks yet) but I LOVE Disney animation, Pixar, Marvel, and Star Wars. In a theme park land I want a distinct, appealing visual aesthetic. In a film, book, or comic I want excellent plotting, characterization, scripting, etc.
The IP I want in EPCOT is EPCOT, however strange that may seem to some. So yes, riding through a bloodstream CAN be more appealing then slapping a GotG label on a ride, since one represents an IP intended for a theme park attraction and the other an IP intended for film and comics.
Also, I find it endlessly ironic that embracing modern EPCOT requires a deep, almost nihilistic cynicism about humanity and our future. Sure, at one point, humanity was hopeful about the future and a theme park could be popular by offering edutainment and optimism, but around the late 90s all mankind became aggressively hopeless and anti-intellectual and the future died so now we all just want to ride roller coasters featuring bored Hollywood stars on TV monitors while the world circles the drain. I don't really buy that.