Just got home from it... Tonally, Gunn absolutely nails it. The main characters are perfectly done, the B-list characters like Mister Terriffic and Metamorpho are perfectly done.
There are issues with some of the C-list / background characters.
Hawkgirl didn't really have much to do and I don't think Gunn knew what to do with her, which is a shame. Giving her a hawk shriek instead of actual dialog was... a choice. She needed more speaking lines.
Similarly, the background characters at the Planet, Cat Grant, Steve Lombard, were just kind of "there". Nobody, not even Perry White, has a "Hey, where's Clark?" moment. I think Gunn was just working from a checklist of who to include.
Ma Kent... I don't know where she's from, but it aint Kansas... Loved the Kents interactions with Clark, but... OK, I'm biased, I married a woman from Kansas, I've been to both Oklahoma and Kansas... I don't know what that accent is.
All of those are minor quibbles. It was a great way to do Superman.
Now: Spoilers:
spoiler
Easter egg reference to Mister Mxyzptlk. Lois and Clark are having a serious conversation while outside the window Guy Gardner, Hawkgirl and Mister Terriffic are fighting a giant glowing eyeball. "Oh, it's just an extra-dimensional imp, they got this."
Setting up Supergirl - Krypyo is her dog, Supes is just pet-sitting while she runs off to a red-sun planet so she can get plastered. The opening of Woman of Tomorrow.
With Mister Terrific and Metamorpho in the same movie, we've now had 1/2 of "The Terriffics", all we need now are Plastic Man and Phantom Girl(!)
