Beautiful. Spectacular. Arbitrary. Dumb.

Rating: 4/10 (28 January 2019)

Score 7.7 of 10 is way too high, I'd give it a 6 at the most, so here's a 4 to offset the 7.7
I know, it's just popcorn cinema, but compare it to the first Avengers movie (2012) which was the same category. I saw that one at least three times. The Hulk smashing Loki around ... there were so many scenes in it I rewatched right away, awesome, funny, sparky, and all part of a whole that kept you going. It had the right ingredients, rhythm, and was mixed well - a cocktail to enjoy.
GotG2 is too arbitrary, it's filled with tropes that are just thrown in as sugar ("They like sugar, right, so let's add sugar."), and it doesn't handle the marvel mechanics well that it chose to deal with. When you introduce mechanics, you define them and you stick with them. But they just arbitrarily decided to do X and then do Y because it fit with what the story was supposed to do next.
Yes, it is visually beautiful and spectacular, and it has its funny moments, but it's not a GotG1, let alone an Avengers 1. You want to have seen all parts of the GotG series for the good ones that will probably follow eventually, so watch this one, but be aware that it has too much the feel of a time waster.