The biggest mistake made with the New 52 cancel Earth 2's World Finest featuring Powergirl & Huntress along with DC's answer to Marvel's FF, the Terrifics.
Both books were incredible reads that were intriguing and adventurous! Karen & Helena trying to find a way home to Earth2 would have loved to see them crossover with the JSA, Titans, and the Authority (Jenny Sparks as leader) . The Terrifics love the team with Phantom Girl, Plastic Man, and Metamorpho with Mr. Terrific traveling the Dark Multiverse wished the book would be still ongoing. Both book would have made great animated or live action series.