Reddit mentions of Joe the Barbarian

Flash:

• The Flash | Mark Waid
  
• The Flash | Grant Morrison & Mark Millar
  
• The Flash | Geoff Johns
  
• The Flash | Francis Manapul & Brian Buccellato
  
• The Flash: Rebirth | Joshua Williamson
  
  Recommended "best/good" DC & DC-imprint:
  
  
• 100 Bullets | Brian Azzarello
  
• American Vampire | Scott Snyder
  
• All-Star Superman | Grant Morrison
  
• Animal Man | Grant Morrison
  
• Batman: Year One | Frank Miller
  
• Batman: The Dark Knight Returns | Frank Miller
  
• Fables | Bill Willingham
  
• Daytripper | Gabriel Ba
  
• Gotham Central | Brubaker & Rucka
  
• Hellblazer (Constantine) | Delano, Ennis, et al.
  
• Kingdom Come | Mark Waid
  
• Omega Men | Tom King
  
• Planetary | Warren Ellis
  
• Scalped | Jason Aaron
  
• Saga of the Swamp Thing | Alan Moore
  
• Sleeper | Ed Brubaker
  
• Sweet Tooth | Jeff Lemire
  
• Transmetropolitan | Warren Ellis
  
• Y: The Last Man | Brian K Vaughan
  
  Recommended DC & DC-imprint Grant Morrison (not already recommended, in order of most-to-least coherent/understandable):
  
  
• WE3 | Grant Morrison
  
• Joe the Barbarian | Grant Morrison
  
• Batman | Grant Morrison
  
• Batman: Arkham Asylum | Grant Morrison
  
• Seven Soldiers of Victory | Grant Morrison
  
• Doom Patrol | Grant Morrison
  
• Flex Mentallo | Grant Morrison
  
• The Filth | Grant Morrison
  
• The Invisibles | Grant Morrison
  
  Modern DC events/crossovers:
  
  
• Crisis on Infinite Earths | Marv Wolfman
  
• Identity Crisis | Brad Meltzer
  
• Infinite Crisis | Geoff Johns
  
• 52 | Geoff Johns, et al.
  
• Final Crisis | Grant Morrison
  
• Blackest Night | Geoff Johns
  
• Flashpoint | Geoff Johns
  
• Forever Evil | Geoff Johns
  
• The Multiversity | Grant Morrison
  
• Darkseid War | Geoff Johns
  
• DC Universe: Rebirth | Geoff Johns
  
  Superman:
  
  
• The Man of Steel | John Byrne
  
• Whatever Happened to the Man of Tomorrow? / For the Man Who Has Everything | Alan Moore
  
• The Death and Return of Superman | Dan Jurgens, Roger Stern, et al.
  
• Kingdom Come | Mark Waid
  
• For All Seasons | Jeph Loeb
  
• What's so Funny About Truth, Justice & the American Way? | Joe Kelly
  
• Red Son | Mark Millar
  
• Birthright | Mark Waid
  
• Secret Identity | Kurt Busiek
  
• All-Star Superman | Grant Morrison
  
• Up, Up, and Away! | Kurt Busiek & Geoff Johns
  
• Kryptonite | Darwyn Cooke
  
• Superman and the Legion of Superheroes | Geoff Johns
  
• Brainiac | Geoff Johns
  
• Action Comics | Grant Morrison
  
• American Alien | Max Landis
  
• Superman: Rebirth | Peter Tomasi
  
  

Check out Joe the Barbarian

http://www.amazon.com/Joe-Barbarian-Grant-Morrison/dp/1401237479

Superman: Red Son

http://www.amazon.com/Superman-Red-Son-Mark-Millar/dp/1401201911

I Kill Giants

http://www.amazon.com/I-Kill-Giants-Joe-Kelly/dp/1607060922

Secret Identity

http://www.amazon.com/Superman-Secret-Identity-Graphic-Novels/dp/1401204511

I think all of these are great books for someone just getting into graphic novels. Out of the four, Red Son is the heaviest, but definitely a really interesting spin on the Superman folklore. That being said, I'm not a Superman fan, and yet I've recommended two Superman novels.