“Guardians of the Galaxy Vol. 2” starts with a considerable handicap: the audience already knows what they’re in for. The first movie surprised because it wasn’t supposed to be good, and was; now, GOTG2 is supposed to be excellent, and mostly, is. The team is back, with the addition of a charmingly naïve empath named Mantis (Pom Klemantieff), who is stuck on a planet with only one inhabitant. That the inhabitant is named Ego should give you pause; that he is played by Kurt Russell, and appears not a jot over 50, should give you night terrors. I’ve seen bricks age worse. But Russell’s eerie youth is being leveraged for a purpose; he is immortal, and has the notches in his bedpost to prove it. One of them is Peter Quill’s mom. Chris Pratt once again brings an appealing, early-Ford-like insouciance to Peter—unfortunately, the movie gives him a fraction of the screen time he got in the first installment, and squanders half of that fraction on a forced romance with Gamora (Zoe Saldana) that seems to exist to service a “Cheers” reference. Thankfully, other relationships are sketched with a lighter hand: Mantis and Drax (Dave Bautista) develop a horrifying version of friendship based on their mutual lack of guile (and filters); Nebula (Karen Gillan, much improved from the first installment) gives her side of the troubled sibling relationship with Gamora, and develops a bit of sympathy along the way; Rocket (Bradley Cooper) pushes away the love of his found family in a way that feels 100% human, 0% CGI raccoon. But all these lively and delicate stories pale by comparison to the main event, which is a war of the father figures—in the left corner, Yondu (Michael Rooker, clearly aware that he is playing the game of a lifetime). In the right, Ego. Peter must choose between the father who kidnapped, bullied, threatened and manipulated him, and the father who wasn’t around to do any of that. The choice appears easy, until it’s not; Platt carefully treads the line between hope and wariness, and Saldana shows a careful tenderness that could easily have melted into romance in the third movie, if the filmmakers had been willing to wait that long. (Alas, it’s easier to talk about a slow burn than to take the time to actually build one. Maybe they should have gone back and watched “Cheers” again.) But who can begrudge anyone a hurried romance when the galaxy is, once again, at risk? It seems churlish to criticize the movie for not being note-perfect when so many of the notes are delightful: Baby Groot (Vin Diesel), tap-dancing his way through an epic space battle. A planet of self-regarding aliens who all resemble Paris Hilton, if she were spraypainted gold. An extended argument about Scotch tape, mid-climax. Exquisitely timed joke payoffs, coming to fruition a full two acts after their setup. A credit roll that will mercilessly test the limits of your bladder with multiple post-credit sequences, all worth waiting for. You will leave the theater bubbling over with glee and catchy pop songs and also pee; but as this movie so aptly demonstrates, two out of three ain’t bad.