Pro: New universe with none of the bad stories of the previous one
Con: New universe with none of the good stories of the previous one
Pro: Superman having a more believable way of concealing his costume in his street clothes.
Con: Superman's costume is armor.
Con: Fortress of Solitude is no longer in the arctic thus taking away that classic location
Pro: Changing Captain Marvel's name to Shazam thus finally ending the decades long explanation of his name, giving a reason why he can say his name without changing, and finally the hood on his costume makes him look more mystical.
Con: Billy Batson is not a likable kid and is basically a little snot
Con: Shazam is not an accronym for Solomon, Hercules, Achilles, Zeus, Atlas, and Mercury anymore
Con: Captain Thunder is a far more fitting name change for Captain Marvel
Pro: Wonder Woman is the daughter of Zeus
Con: Could have been worked in without the reboot
Pro: Aquaman is still a badass
Con: Everyone in the comic treats him like crap and think he's useless when they have no reason to
Pro: Caitlin Fairchild, Grifter, and most recently Mr. Majestic, three of my favorite Wildstorm characters being introduced into the DCU
Con: Grifter's series sucks and Majestic is no longer anything like himself.
Pro: Making a new Teen Titans team
Con: Getting rid of all the original members of the Teen Titans, thus destroying one of the greatest teams in comics
Con: Removing the original Teen Titans members means removing the crucial events in their lives that shaped who they were
Pro: Earth 2's premise of a modern day Justice Society is highly original and interesting
Con: Massive punch in the face to the original characters in every facet imaginable
Pro: Batman's corner of the universe staying basically the same
Con: Batman's entire history as well as the history of his supporting cast crammed into a 5 year time frame.
Con: This means Batman went through four Robins in just under 5 years when it should have been 10 at the least.
Con: Mr. Freeze is just another random crazy guy that just happens to have ice powers
Pro: Justice League Dark because it was the most awesome thing DC has put out in recent years.
Con: It could have easily been done without the reboot.
Pro: Red Hood and the Outlaws
Con: Starfire, a character I have always wanted to like OUTSIDE the Teen Titans animated version(Seriously I love that version of her) is the biggest slut in comics now
Con: Lobo is no longer the universes ultimate badass and is just lame now. What happened to the Main Man?!?!??!
Pro: The New 52 is like Ultimate Marvel, having many good and interesting ideas.
Con: Many of these good ideas could have been worked in without the reboot and are only good ideas on paper. There's also no regular DC universe to fall back on unlike what Marvel has.