Does an espionage game get better than the standoff in Georgia, followed by the simple, yet, elegant assassination. Why do I say elegant? Because it was willing to forsake video game convention in the form of a "boss battle" and instead gave us an scenario to play through that felt authentic. It was action, but it was simple. Shoot the bad guy in the head, he dies. No life meters or other "gamey" stuff. Furthermore, the real challenge of that scenario wasn't in pulling the trigger, but in getting out, ie, exfiltration.
Sam finding out about his daughter, blah. Sara's character should have never been developed beyond the roles she played in the first games.