I first saw Thor Ragnarok in Imax, 3D. I enjoyed the movie very much, it was a fun ride. The 3D added to the enjoyment, it does not always. The surround sound was very good.
Just a small announced spoiler at the end.
As the movie opens, Thor has a funny encounter with Sultur, the Fire Demon. The previous Thor movies have been successful, but not as successful as some of the other in the Marvel Universe. So there is a definite effort to change the character, played well this time by Chris Hemsworth, into something more relatable and human. He quickly loses his hammer and gets a haircut and develops a sense of humor that follow s him through the movie.
There are two major plots: First, Thor older sister, Hela, the Goddess of Death, plans to take over Asgard now that Odin has croaked. She is skillfully and Marvelous played by Cate Blanchett. The beginning and final part of the movie concentrates on that.
Second Plot: Thor is shanghaied to a distant planet, ruled by The Grandmaster (Jeff Goldblum) where he must, as a gladiator, fight the Hulk. This is reminiscent of the successful comic series, “Planet Hulk.” (A sidebar: There will be no Hulk movie. While Marvel owns the right s to the character and can use him, Universal still holds the rights to the movie distribution).
Tom Huddleston is back as Loki messing up everything Thor tries to do. Frankly, he as before, almost steals the movie as he is so much fun to watch. But Goldblum and Blanchett are also wonderful.
There is a ton of action and suspense all of it totally ludicrous, impossible, sometimes predictable, but always fun. Idris Elba appears a Heimdall and ther is a great, funny and totally appropriate cameo by Dr. Strange (Benedict Cumberbatch)
Stay till the very end, there are two scenes during the credits.
It looks and sounds incredible on the 4k disc
Small spoiler:
The movie ends with the Asgardians looking for a new home. This happened recently in the comics here they found their new home on Earth.