Missing the point
The Good:
The execution was great. It is a thousand times better than Justice League. Very emotional, good storytelling, awesome art. If you know nothing about Earth-2, you will have a blast.
The Bad:
The entire concept of rebooting Earth-2 is stupid and lame. Earth-2 was always about staying in continuity with the Golden Age. It was about paying an homage to these original versions of the characters, the ones who originated it all. That is why in both Crisis and Infinite Crisis, the real hero turns out to be Earth-2 Superman, out of respect for the character, the first superhero and the origin of the entire DCU. Earth-2 and the JSA are also at the center of the idea of legacy and passing the torch in the DCU, through Infinity Inc or John's JSA or Robinson's Starman.
With this reboot, all of that is now gone. We are back to de-aged unmarried generic superheroes with no sense of legacy (so basically what we already have on rebooted New Earth) or homage to DC's past.
It is just a waste of a great concept. DC and Robinson are completely missing the point here.