Saw it today. It was OK. It just felt rushed, like they jumped into the group movie too fast and they just brought back Superman too easily. I did like the reference that Bruce Wayne made to Clark being the most human (back to the point that Kal chooses to wear the mask of Clark).
The character development just isn't there overall for me though like Marvel has taken the time to do.
Well, there's a problem there on how they made Clark Kent back when he was on the newspaper declared dead, and a lot of people attended his funeral.