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So, currently in Rebirth the biggest event is DC Metal, do I understand what is going on? Not exactly, but they explain it in the plot. It's basically an event that shows two things: Scott Snyder's love for Batman and Snyder's love for horror stories, the Batman who Laughs being clearly based off Hellraiser's Cenobites, if I'm going to be honest, I'm more about the Dark Knights than anything, but the event has been enjoyable so far. Here is a list of the tie-ins and one shots.
Superman and Action have been solid so far, Superman has lowered own the quality a bit, but Tomasi and Gleason have done a decent job showing the adventures of Superman and his offspring Jon, Action is more Supes-oriented and starts slowly but it becomes better, all you need to know is that this was the post-crisis Superman and the n52 Superman died.
I am reading Batman only for the wedding even if I know it won't last, and if you want a point to start, I'd recommend War of Jokes and Riddles, even if the end was a bit underwhelming.
Wonder Woman by Rucka I consider it a good read, nowhere as good as his first run but still better than what we had in the n52 (in my opinion).
Now, about the n52 (the event before rebirth/the reboot) some things have stayed in canon while others have not. I enjoyed Joker: Endgame by Snyder, but that's because I had it on trade (and even though I don't like when jOkEr TaLks lIkE tHiS, I considered it decent...whatever came after not as much). My favorite comics of this era was Batman and Robin from Tomasi and Gleason and Robin: Son of Batman from Gleason. Gleason and Tomasi are the ones that are currently on the Super-title.
Pre-Flashpoint has it's ups and downs, but depending of the hero you're interested in, I can recommend.
New Teen Titans by Wolfmann and Perez, I read it until The Judas Contract, and it was a very enjoyable read, you get badass moments like Dick hanging out the green leathers to become Nightwing, Wally is a pain on this, so read Flash: by Mark Waid to get a more enjoyable portrayal.
JLA by Morrison: I just started reading it and it's great!
Wonder Woman by Greg Rucka: My favorite run is Phil's, but his run isn't collected completely yet Byrne is for some reason. But Rucka is wonderful, I consider it the natural evolution of Wonder Woman by George Perez (that I recommend too, but it might be too much dialogue if you're not into that) and the fact it didn't end like Rucka wanted to...a loss of potential.
Young Justice by Peter David does a great job in setting up the second generation of sidekicks, it might be "too 90s" at times, but if you want a good, fun read, there is YJ.
Teen Titans v3 by Geoff Johns: Now, Assam will disagree on me with this , because the characterization of the YJ team is...quite debatable to say at least, but if you want some "serious" comic, it has plenty of serious moments and badass ones too, like the fight with Dr. Light. It went down after IC and when it started to get better we got rebooted. Still, it was the first trade I got, and I liked it for what it was
Death of Superman, Funeral for a Friend, Reign of the Supermen and Return are considered classic Superman stories.
Gail Simone's Birds of Prey is considered one of the best all female superhero teams, I consider the quality went down a notch after she left the first time. But still, it was wonderful.
Gotham City Sirens by Dini (I think) it was also one of the first comics I read, and I considered it fantastic too.