And no, I don't mean uplifting and comical. I mean solid, well-crafted, narrative and visually pleasing. This episode has a cinematography that could very well be featured in a movie. Still too early to tell anything about the plot, but I can already see which characters are going to be relevant based solely on the way they're framed when they show up. That's the director stating "Hey! Pay attention! This guy is about to do something!"
Hard to tell if they used a double for the acrobatics, but if they didn't and that's actually the actress, then she an extra mark for that.
The only "but" I give it, is that they essentially rebooted the JSA we've seen in Legends, Arrow and Flash, which opens the possibility of introducing a new Arrow, a new Flash, and new *everyone else*s, which is not something you do when you have another version of the same character already developed.
A JSA show set in the 1960's would have been ten times better, without the plot devices of modern shows.