For it's short length, it does a great job with establishing it's world and characters. A different timeline set after the end of the Korean War. Our heroes struggle for acceptance in this world that fears them. It's quite nice that the focus was on less popular heroes for once. In particular, Green Lantern, Martian Manhunter, and The Flash. The likes of Superman and Batman are mostly on the sidelines. It'd be like a Super Smash Brothers film, where all the attention was on Samus, Captain Falcon, and Ness!
And thankfully, unlike First Flight, Hal Jordan has character development!! In fact, he's arguably the main character. Everything kicks off with his regrets after coming home, and then slowing overcoming it. The late Miguel Ferrer (playing a hero this time), David Boreanaz, and Neil Patrick Harris were the standouts!!