To the OP. Pre-Flashpoint Supes had some major clunkers before New52 came and made him moderately interesting again.
"Reign of Doomsday" was mixed. I'd say avoid. (more Doomday villain decay)
"The Black Ring" which covered the death of Lex Luthor was intriguing and a nice follow up to Blackest Night. It gave us a look in a Lex's perception of himself but it's brought down towards the end when it's revealed it ties in to "Reign of Doomsday". Ick
"Grounded" People have already ripped this series a new one in this thread. I have nothing to add.
"Brainiac"/"New Krypton"/"Last Stand of New Krypton"/"War of the Supermen": was 2 years (starting in 2008-ending in 2010) of building up a grand story, only to be pissed away by James Robinson when he replaced Geoff Johns for "War of the Supermen". 100,00 Krytponians killed in Robinson's 100 minute war/restore the status quo before JMS takes over the comic next. I'm still pissed about that.
The above comic series are what plagued Superman pre-Flashpoint. By the time New52 came I was relieved. Grant Morrison's run on Action Comics Superman and Geoff Jonh's JLA is all I care about with regards to Nu52 Superman.
If you want some good tales starring the Man of Steel, I'll list you some.
Man of Steel by John Byrne. 8 volumes available on paperbacks from his 1986-1988 run.
Superman Birthright by Mark Waid
(The above two comics had many of their themes lifted and used for Zack Snyder's film Man of Steel)
All Star Superman: Grant Morrison
JLA Earth 2 by Grant Morrison
Action Comics Superman Vol 1-3: Grant Morrison
Superman for All Season: Jeph Loeb
Superman Red Son: Mark Millar
Superman For Tomorrow: Brian Azzerello
Superman Secret Origin: Geoff Johns
Superman Last Son: Geoff Johns
Superman and the Legion of Superheroes : Geoff Johns
Superman Brainiac (skip New Krytpon that follows): Geoff Johns
Whatever Happened to the Man of Tomorrow: Alan Moore
Superman Earth One vol 1-2: JMS (way better than his "Grounded" nonsense.)