Maroney - Not on the team (or in the NFL)
Merriwether - Not on the team and barely plays on the team he's on now
Chung - solid but not spectacular
Mayo - see Chung, Patrick
Solder - pretty good but the jury's still out (still didn't fill a huge area of need)
The 2 superbowl loses were caused by defenses that were fundamentally built wrong with the same mentality
2007 bend but don't break with an aged core defense
2011 bend but don't break with a nonathletic defense with no real play makers.
The defense sucking is bills fault and the nfl rules