It's often said, but the margin of victory is so thin in the NFL it often hinges on one or two plays. I totally agree that it's frustrating to see the games we *could* have won if we had just executed a "little" better at the key moments: Dallas, Cincy, Detroit, even Arizona are four of our 6 losses that could have gone the other way.
On the other hand, we have also won razor thin games, due to key plays: what if Eli doesn't throw key picks in that third game...we may go 0-3 and in full rebuilding mode early in the season. Late INT and fumble by Cleveland stopped their rally when we couldn't stop Crowell or Pryor. Kerrigan's strip sack on Wentz vs. Phiadelphia basically bailed out another horrible late game defensive collapse.
This is kind of an intangiable thing that separates great teams from average teams. They more often seem to make the right plays in key situations at the right time. I'm not sure exactly how you get there, but I guess a lot of it has to do with discipline and coaching and consistency.
Not saying you are wrong...I agree we blew chances. But we also benefited from close games. I guess I agree with your point but think it really just shows that this idea of staying disciplined and making key plays at the right time is really, really key and impacts many "average teams," with teams like the Patriots standing apart for their consistency...