So I just picked up Rebirth 1 and I have to say I liked it a lot. Johns doing what he does best, highlighting legacy and history as the focal point mixed with love & friendship.
The story is really good and is almost like this meta "apology" DC is giving to their fans for the last 5 years. It starts with Wally West trapped in the speed force, pointing out that Wally is one of the few beings who remembers the pre flashpoint universe.
Story does a few things
1) pulls real Wally back through the speed force in which he was trapped Barry Allen. Allen finally remembers the pre flashpoint universe. Also explains the black Wally west.
2) Pandora is destroyed
3) reveal that Wonder Woman had a brother
4) Darkseid being reborn
5) Original Dr. Fate coming back appearing to Ted Kord, the original Blue Beetle, who is no longer the BB.
6) a shadowy unknown figure appears to what seems to be a version of Superman who was killed by Doomsday from way back when
7) reveals JSA Johnny Thunder remembered everything the entire time and is trapped in an old age home. He's called upon to call for help, when Wally tries to break free from th speed force
8) reveals 3 jokers which Seem to be the, pre-crisis, post-crisis & New52 Joker's.
9) Batman showing he has Watchmen "The Comedians" famous yello, blood splattered pin
9) huge reveal that the 10 years missing in the new 52 has something to do with what appears to be Dr. Manhattan and Veidt.
I'm leaving some stuff out, but this is decent checklist of the story.