People say skip the first season, but I think they should skip the last season. Outside of the Flash episodes, it isn't good at all. They clearly didn't expect to make that season and the stories and writing are really uninspired. It's such a bummer coming off the greatness right before it.
Season one is okay, but they went a little heavy with the two parters and Superman getting his ass kicked all the time. Season two of JL and season one of JLU are unstoppable. On the rewatch, one of my favorite episodes was the dream guy in season 2. All of the League falling asleep into their nightmares as a voice laughs over all of them was one of the creepier moments in the entire series.
As for the Bat Embargo, I thought Huntress/Black Canary were Bat-related, so why were they allowed on the show when everyone else had been cut out?