Vernon's inability to recognize good pitches to hit is well known to all who saw him at the plate this past season. It has been noted previously that Vernon Wells had the 2nd worst OBP by any LF in the history of MLB with at least 520 PAs (.248). Only Joe Sommer managed to "accomplish" a worse OBP in 1886 (.241).
What should be noted is Well's dismal ability to hit line drives. Granted, there are discrepancies between official scorers in different ballparks on what constitutes a line drive. That said, amongst players with more than 500 PAs between 2004 and 2011, Wells' 2011 campaign set this mark:
2nd worst line drive (LD) rate (12.3%)
Hopefully Vernon is able to work through his issues and return to being a 3+ WAR player. Unfortunately, not that these two outcomes are mutually exclusive, a more likely outcome is Wells is Appiered (or Kazmired if one prefers) before his current contract runs its course.
Looking at advanced stats such as a Wells' in-field fly ball (IFFB)% and you truly wonder what in the world Scioscia/Reagins were thinking last January.
*FanGraphs does not provide data on line drive rates prior to 2004 (well, at least from what I could recognize).