So before I get to anything else: Adam Warlock is in play! Not in the movie itself but he's mentioned, at least by first name, in the third of 42 end credits scenes. I always figured he'd come after the Infinity War because anything else would literally feel as if he's being shoehorned in for the sake of the story. Finally having that confirmed is fantastic.
I will say one other thing and it's that Marvel appears to be setting themselves up for a number of possible movies in the future; we now know that The Watchers are apart of the MCU which will play fantastically into the next couple of movies for Phase III.
Now onto the movie, as a sequel it was fantastic; as a movie in the MCU it continued playing to its strengths and nothing felt forced or awkward; there was just enough laugh out loud comedy mixed in with the more emotional tones. I do feel there was a little cliche with Gamora and Nebula, but on the opposite end of that it actually makes sense — she's always hated Thanos far more than she's ever hated Gamora, so finding out she just wanted a sister at the end of the day and not the relationship they ended up having is... actually sound.
Drax was fantastic. There's really not much else I can say: he's crass, brutally honest, and a goddamn child at heart. Never change him and never cast anyone other than Dave.
Yondu.
Though apparently he's in Infinity War so...
Ego. Everything about it/him was perfect. Though in the beginning I was so convinced he was the embodiment of the Ego gem that I completely forgot about the living planet of the same name.
There's no way Kurt is 66 and looks that good; whatever him and Bob Barker take I want some of it.
I'm definitely going to go see this again and I'm definitely going to see through the 75 end credits scenes again.