The best one so far
All the story was great but the part that got me was when superman appeared it was great seeing that famous moment again. This limites series is great for people that are not very familiar with DC, me for example I'm not that familiar with the Golden Age heroes and the JSA. As for the silver era, is great to see all the first appearances of all the heros even if you already know them.
The only bad thing was that panel of the JLA holding hands, maybe in the 60's when the league first appeared they held hands, but if you are retelling the story for our time then is unacceptable to have batman holding hands with anybody.
Cumbaya moment aside the issue was a very fun read, I recommend this for new reader who aren't familiar with the history of the DC universe, it should be very useful.