I'd give it a D. It's broken a lot of things that were working quite well before Bendis came along, to the point that someone's going to have to clean this mess up yet again before all is said and done.
Superman has been a roller coaster for a long time now. New 52 was bad, Rebirth righted the ship, now Bendis is taking it downhill again. It's exhausting, not fun. I have dropped both books for the foreseeable future.