It's an all to common scenario. We meet in our respective teams, and discuss how we can improve. A healthy exercise for sure, but unfortunately, the outcome often does not align with the initial goals defined at the outset. Despite a commitment to "where did WE win and lose" it moves to "were did YOU win and lose."
If we took a break from the madness of blame-game and all took ownership of every issue under personal control...wouldn't everything be on the table and ready for correction. Rather than pointing at where members of the team went wrong, and volunteering how you could've fixed or helped...the ship would with no doubt right-size and the team could move on. Instead, we try to solve issues by picking of micro-concerns 1-by-1 and shooting team members like they were playing Duck Hunt.
When meeting with your team, prepare with a list of the areas that you let others and the team down, with a plan on how you can improve. Most will follow, and the team will benefit.
Own it...Fix it!