Just got back from seeing this in IMAX and it was worth every penny.
I LOVED it.
James Gunn got to tell the story he wanted to tell over 3 films and he did it extremely well.
I'd say it is probably worth watching the Holiday Special on Disney+ for anyone who hasn't seen it prior to watching Volume 3, just so you're up to speed on where the team is.
John Murphy takes over scoring duties from Tyler Bates who worked on Volumes 1 and 2, but John scored the Holiday Special and goes straight into this film with that momentum and even calls back to Tyler's work which is fitting given the themes of the film. As you'd expect there is also a great soundtrack with various artists expanded to include the 90s and 2000s courtesy of the Zune Peter was given by Yondu in volume 2.