The "IFFY" 2012 draft (which I don't think is really bad) is sandwiched between excellent to outstanding drafts of 2010, 2011, 2013, 2014 & 2015. That being said, Claiborne, Crawford, Wilber, and Hanna have been very productive as a group. The 2012 draft in my opinion, did not stink.
The draft in 2009 on the other hand, was lousy to say the least.
Jason Garrett had to do a complete overhaul of players and coaches to get the right personnel in place to not just compete for a Super Bowl this year, but in the years to come as well.
I am also under the belief that Bill Parcells taught the Jones' and the scouting department what to look for in acquiring players. Since Parcells arrived in 2003, only the 2009 and 2004 drafts have really been downright stinkers. The draft in 2009 stunk moreso than 2004.
My truly excellent to outstanding drafts since Parcells arrived are:
2003: Newman, Witten, and James
2005: Ware, Spears, Burnett, Canty, Barber, and Ratliff
2008: Jones, Jenkins, Bennett and Scandrick (and Eric Walden has thrived with other teams)
2010: Bryant and Lee
2011: Smith, Carter, Murray, and Harris
2013: Frederick, Escobar, Williams, Wilcox, and Randall
2014: Martin, Lawrence, Hitchens, Street, Gardner, and Bishop
2015: HOPEFULLY all of them
When you string excellent drafts like this form 2010-Present, Super Bowls usually are the result.