I've been reading this series ever since it came out and it's been pretty good so far. None of the issues have been AMAZING but they do range from great (#2) to good (#1).
So far we've had Violent Minds by Jeff Parker and Chris Samnee, which was a solid story that felt very 80's, then Fortress by Jeff Lemire, a great little story that I felt was quite touching, and Bizarro's Worst Day by Justin Jordan and Riley Rossmo, a fun little story about Bizarro which, again, felt very classic.
I'm interested in the different takes on Superman we'll be seeing through the series since DC had originally announced plenty of authors that I never thought I'd see work on Superman, and the ones we've got so far have been pretty enjoyable. I just hope we get some multi-part arcs like the ones seen in Legends of the Dark Knight, Batman's own digital anthology series.
And if you aren't reading this for certain reasons, don't worry, the series is now 100% Orson Scott Card free! :P
(Although I have to admit I kinda wanna see what his story would have been like).