Take this review with as many grains of salt as you like, as I had the flu when I watched it, and I am 61 years old.

3 of the main characters could be mapped too easily to Star Wars characters. Peter Quill -> Han Solo (w/ a little Luke thrown in), Gamara -> Leah, Groot -> Chewy, (did not see Rocket as any SW character)

Special effects? Many say visually stunning, to me it was sometimes visually confusing, especially some of the space battle scenes. This could be the 61-year old, flu-ridden brain just not able to keep up. But my sense is it was too much of a good thing.

Groot delivered an emotionally-engaging performance with a 3-word vocabulary. The others, not so much.

Perhaps I'll re-watch it after some time has passed and see if my opinion changes.