yeah, unfortunately I agree. You can probably enjoy some parts because it consists of multiple one shots with an ongoing subplot, but as a whole you gonna be lost at certain points.
That's the only thing I don't like with Morrison's DC stuff from recent years, you can't just pick up a book and enjoy it without 30 others. If you are into his writing it is very rewarding but also time and money consuming. Even his n52 Action comics didn't feel like an introduction to new readers and that was the intended purpose of the whole book!