BAD THING: You usually expect an issue #50 to be the big conclusion of a story or the start of something big. Despite the fanfare on the cover, this issue is the middle of an on-going story and a poor place to try and start reading this book.
GOOD THING: Ignoring that, this is a good solid issue with a lot of solid characterization and good action scenes.
In face, the only real problem with this issue is that - as John Stewart points out - there's no reason for Cyborg Superman to be spilling his guts to John given that he's in the process of turning him into a mindless robotic slave. So the exposition rings hollow even if this IS a good explanation for how Cyborg Superman survived the end of The Sinestro Corps War and Blackest Night.
The Final Verdict: It's not your typical #50 issue. It's the middle of a storyline, rather than the end of one and not a good place to start reading this book. Still, good art and great character moments made this a solid issue if a poor place for newbies to jump in.