Really enjoyed it. Feel like it did a great job balancing everything and telling a pretty good story with one of Marvel's best villains to date. Top notch action, visuals, and great character moments for almost everyone. Feel like everyone had a "character arc" which is not an easy thing to do in an ensemble film. Not all of them were huge character arcs, sure, but better than them just "being there".
Was "surprised" at Adam Warlock having so little to do in the movie after being a "much hyped character debut" but again, even with being barely in it he did get a character arc (and technically got all the action going at the start so he was essential to the story).
The "hallway scene" that M-A-G mentioned was freaking sweet, gotta be one of the best action scenes in the entire MCU.
I have never "teared up" for a Marvel movie before, let alone twice... so this deserves recognition for that too.
Overall, very good. I might even watch it again, which I never do with Marvel movies anymore.