IMO, Different is not necessarily lesser. There are Major differences between the parks that this film was previewed in (DLR vs WDW). I would say that from a show/theme perspective, GoTG is not really a good fit for DAK.
In my opinion, it is not a good match for the ITTBAB theater either. Although I did not see the sneak Preview at DCA, I have a friend that did. In his opinion, the effects felt forced. Another thing that he felt negatively impacted the preview was that the attraction film (ITTBAB) is matted to match the custom shaped screen, and GoTG was not. From the film makers perspective, did any of those effects serve the vision that James Gunn had for his movie? For me, DHS is a great place to present these sneak previews. It is a park about Hollywood and movies and movie related entertainment. The area in which they are previewed (ABC Sound Studio) is located in a modern Production themed area. It seems more appropriate than shoehorning a space movie into a Pixar/A Bug's Life themed area, just to take advantage of effects of negligible value.