Teyarch's David Vonderhaar Tweeted earlier today, "See that gun to my head in my pic? That's how I feel about Second Chance. We meant well. I f***ed up."
The Second Chance perk allows players to absorb fatal damage and then use a pistol for ten seconds before dying, with a Pro version upping the time-frame to 30 seconds and giving a team-mate chance to revive you.
Infinity Ward's similar perk — Last Stand — was tellingly removed from Modern Warfare 3.