Was able to ride twice on our trip and it's our group's new favorite ride on property!
I will be the first to admit that I was never an EPCOT purist, so perhaps my opinion is a bit out of the mainstream for this site, but I believe this attraction is just what EPCOT needed. It is certainly a monumental improvement over the Energy pavilion in my opinion.
The smoothness of the ride is unlike any rollercoaster I've ever experienced, the music is so fun, and the on-ride projections and props are very well done.
I am a huge theme park fan and less of a "Disney" fan. I've watched the Guardians of the Galaxy movies and found them to be pretty decent, but I've never had any real affinity for the franchise. Yes... I will be the first to admit that the story is very difficult to follow once you get on the ride, but I think for this attraction, story takes a back seat to
fun. I'd give it 4.5/5 stars and rank it the best attraction in the park.
If Disney would add one more solid E ticket to the front half of the park and maybe 2 more rides (not mere "attractions") to World Showcase, EPCOT could finally take its rightful place as a world class second-gate. (Oh, and please fix Imagination for crying out loud!)
(Please don't come for my neck.)